slimta/python-slimta

Python libraries to send, receive, and queue email.

API Documentation and Manual

---

About

The python-slimta project is a Python library offering the building blocks necessary to create a full-featured MTA. Most MTAs must be configured, but an MTA built with python-slimta is coded. An MTA built with python-slimta can incorporate any protocol or policy, custom or built-in. An MTA built with python-slimta can integrate with other Python libraries and take advantage of Python's great community.

The python-slimta project is released under the MIT License. It is tested for Python 3.6+.

Getting Started

Use a virtualenv to get started developing against python-slimta:

$ cd python-slimta/
$ python3 -m venv .venv
$ source .venv/bin/activate
(.venv)$ pip install -U pip wheel setuptools

To run the suite of unit tests included with slimta:

(.venv)$ pip install -r requirements-dev.txt
(.venv)$ py.test

Running the Example

The example in examples/slimta-mail.py provides a fully functional mail server for inbound and outbound email. To avoid needing to run as superuser, the example uses ports 1025, 1465 and 1587 instead.

It needs several things to run:

• An activated virtualenv as created above in Getting Started.

• A TLS certificate and key file. The easiest way to generate one:

openssl req -x509 -nodes -subj '/CN=localhost' -newkey rsa:1024 -keyout cert.pem -out cert.pem

• A populated examples/site_data.py config file.

Check out the in-line documentation with --help, and then run:

(.venv)$ ./slimta-mail.py

Manually or with a mail client, you should now be able to deliver messages. On port 1025, messages will go to unique files in the current directory. On port 1587, messages will be delivered to others using MX records! To try out a TLS connection:

$ openssl s_client -host localhost -port 1587 -starttls smtp

Contributing

If you want to fix a bug or make a change, follow the fork pull request model. We've had quite a few awesome contributors over the years, and are always open to more.

Special thanks to JocelynDelalande for extensive work bringing Python 3 compatibility to the project!

python-slimta's Issues

spamassassin tests are missing

slimta.policy.spamassassin is not covered by any tests

see also #35

Expose socket_creator Relay option

Needing to bind to a specific outbound IP is a very common and important pattern in mail. This "hidden" option should be exposed and documented.

References #28

Handle NoNameServer error

Hi,

I'm using Slimta and this app is really awesome, but sometimes we have a problem when we request so much queries to the DNS server at AWS EC2. The error is appearing:

[11/06/2013 11:32:20 PM] exception:NoNameservers:unhandled args=() message='' traceback=['Traceback (most recent call last):\n', '  File "/home/myapp/production/web_app/mailerwe
b.sender/src/python-slimta/slimta/queue/__init__.py", line 315, in _attempt\n    self.relay._attempt(envelope, attempts)\n', '  File "/home/myapp/se
nder/src/python-slimta/slimta/relay/__init__.py", line 86, in _attempt\n    return self.attempt(envelope, attempts)\n', '  File "/home/myapp/sender/
src/python-slimta/slimta/relay/smtp/mx.py", line 203, in attempt\n    dest = self.choose_mx(record.get(), attempts)\n', '  File "/home/myapp/sender/
src/python-slimta/slimta/relay/smtp/mx.py", line 73, in get\n    self._records, self._expiration = self._resolve()\n', '  File "/home/myapp/sender/s
rc/python-slimta/slimta/relay/smtp/mx.py", line 98, in _resolve\n    return self._resolve_mx()\n', ...]
Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/gevent/greenlet.py", line 390, in run
    result = self._run(*self.args, **self.kwargs)
  File "/home/myapp/sender/src/python-slimta/slimta/queue/__init__.py", line 315, in _attempt
    self.relay._attempt(envelope, attempts)
  File "/home/myapp/sender/src/python-slimta/slimta/relay/__init__.py", line 86, in _attempt
    return self.attempt(envelope, attempts)
  File "/home/myapp/sender/src/python-slimta/slimta/relay/smtp/mx.py", line 203, in attempt
    dest = self.choose_mx(record.get(), attempts)
  File "/home/myapp/sender/src/python-slimta/slimta/relay/smtp/mx.py", line 73, in get
    self._records, self._expiration = self._resolve()
  File "/home/myapp/sender/src/python-slimta/slimta/relay/smtp/mx.py", line 98, in _resolve
    return self._resolve_mx()
  File "/home/myapp/sender/src/python-slimta/slimta/relay/smtp/mx.py", line 85, in _resolve_mx
    answer = dns.resolver.query(self.domain, 'MX')
  File "/usr/local/lib/python2.7/dist-packages/dns/resolver.py", line 974, in query
    raise_on_no_answer, source_port)
  File "/usr/local/lib/python2.7/dist-packages/dns/resolver.py", line 817, in query
    raise NoNameservers
NoNameservers
<Greenlet at 0x4e0eeb0: <bound method Queue._attempt of <Queue at 0x32a3e10>>('a7075c33019e4e028ac6776d9805152a', <Envelope at 0x72a2250, sender=u'527a9d7c70cba9563, 2)> failed with
 NoNameservers 

There is a way to deal with this?

Allow custom logic to set outbound EHLO on Relay

Add a callback that is called early in the connection, with its return value being used by the EHLO command.

• Possibly call twice, before STARTTLS and after?
• TODO: Figure out information this callback will need passed in.

No way to do the following scenario in 3.0.0 easier than in 2.0.0

Acquire an Envelope

• inspect the recipient and the sender
• External logic decides an ip and an ehlo
• Attempt the envelope thru a MxSmtpRelay which is constructed with a socket_creator which uses the said ip and using the decided ehlo.

There are benefits in using the MxSmtpRelay class, because it can re-use a non-closed socket, via the idle_timeout parameter. The new 3.0.0 capability of providing the echlo_as as a function isn't very usefull, as you may want to use a different ehlo on the same MxSmtpRelay class. I just can't imagine using it, because i create an object which holds multiple MxSmtpRelay instances, each with it's own source_ip.

I've worked around this in 2.0.0 and 3.0.0 looks as difficult.

Coverage does not count some files

For ex if you look at https://ci.slimta.org/job/python-slimta-PR/7/PYTHON=CPython-2.7/cobertura/slimta_policy/

You can see that slimta.policy.spamassassin is missing. It seems that the only files taken into account are the ones where the tests goes at least one time.

haproxy support for original ip address

Slimta works great with haproxy, but when you need to saturate all CPU cores, you end up starting more inbound processes. Haproxy helps with that, but it also hides the original ip address. There seems to be a PROXY protocol that both postfix and haproxy support, but i haven't made much of it, even after trying it up with wireshark:

http://permalink.gmane.org/gmane.comp.web.haproxy/8881
http://www.haproxy.org/download/1.5/doc/proxy-protocol.txt

Then i found this:
https://pypi.python.org/pypi/pwho/0.1.0

Before i start messing up with this, is there another way of obtaining the original ip address of the sender? I might have overlooked.
Thanks.

Possible bug? Do I need to set self.session.auth_result myself?

Does my Auth class need so set self.session.auth_result? I thought Slimta would do this for me. Nothing in the Auth documentation says I need to do this.

http://docs.slimta.org/en/latest/api/slimta.smtp.auth.html

I'm authenticating successfully, but later on in my Validator, self.session.auth_result is None. Which surprised me.

>   220 ESMTP server
 -  EHLO ripple
>   250-Hello ripple
>   250-8BITMIME
>   250-AUTH LOGIN PLAIN
>   250-ENHANCEDSTATUSCODES
>   250 PIPELINING
 -  AUTH PLAIN [base64 data]
>   235 2.7.0 Authentication successful
 -  MAIL FROM:<alice@local> 
>   250 2.1.0 Sender <alice@local> Ok
 -  RCPT TO:<bob@remote>
>   550 5.0.0 relay not permitted
expected: 250 

---

And here is a trimmed down snippet from my Validator:

  def handle_rcpt (self, reply, recipient):
    print 'handle_rcpt  %s' % recipient
    print '  auth %s' % self.session.auth_result
    if self.session.auth_result:
      # todo: confirm sender matches auth login                                 
      pass
    else:
      print '  no auth'
      reply.code = '550'
      reply.message = 'relay not permitted'

It prints:
handle_rcpt bob@remote
auth None
no auth

---

This is interesting: self.session is different in my Auth and Validator! Unexpected!

('verify_secret', 'alice@local', 'pass_alice', '')
session <slimta.smtp.server.Server object at 0xa3e00ec>
auth_result None
handle_rcpt bob@remote
session <slimta.edge.smtp.SmtpSession object at 0xa3dcfec>
auth_result None

Note: I expect auth_result to be None inside verify_secret, because it is verify_secret that performs the authentication.

---

My Validator needs to know more than whether or not authentication was successful. It needs to know who authenticated successfully (and compare it to the MAIL FROM address). And given that Auth and Validator have different sessions, I don't see an easy way for them to communicate.

Any suggestions?

How to handle bounce envelope in custom Relay?

If I implement a custom Relay which handles inbound mails and something goes wrong, the celery queue (I guess other queeus too) send a bounce message to the custom Relay.

Should the custom Relay handle bounce messages too? Or what's the best way to get rid of the bounce envelope? Should the queue not use a different Relay for bounce envelope?

I'm asking because a custom inbound Relay has only to do with receiving mails.

Drop support for python 2.6 ?

Open question : does supporting python 2.6 worth the effort ?

I just started hacking around with slimta, and already noticed 2 times python2.6 was not blocking me but made the things a bit less elegant:

• the use of unittest2 dependency
• the usage of several context managers in a single call

I know 2.6-> 2.7 is a big usefull version and expect to face other cases. Also, python 2.7 API is quite designed to be easy to build programs running with both python2 and python3 (see #26 ), all major distros have benn on py2.7 for years so, what remains ?

@icgood what do you think ? (open question)

Include command in SmtpRelayClient errors

The error reply generated here does not properly carry over the command field of the original Reply that caused the exception. This causes errors to say [unknown command] even when they happened while waiting for the response to a command.

DKIM

Hi Ian,

Is there in the pipeline a slimta's version with DKIM support?

Thanks so much!

SmtpValidators.session documentation

It appears that the base class SmtpValidators has a member named "session".

Since subclasses may wish to access self.session, self.session should probably be documented. (The constructor parameter named session is documented, but self.session is not)

http://docs.slimta.org/en/latest/api/slimta.edge.smtp.html

Incompatibility with Django

Working on an application using both Django & slimta (and thus gevent).

There is some errors with Django dev tools (test runner, and devserver) :

Traceback (most recent call last):
  File "./manage.py", line 10, in <module>
    execute_from_command_line(sys.argv)
  File "/home/jocelyn/.virtualenvs/gevent3/lib/python3.4/site-packages/django/core/management/__init__.py", line 350, in execute_from_command_line
    utility.execute()
  File "/home/jocelyn/.virtualenvs/gevent3/lib/python3.4/site-packages/django/core/management/__init__.py", line 342, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/home/jocelyn/.virtualenvs/gevent3/lib/python3.4/site-packages/django/core/management/commands/test.py", line 30, in run_from_argv
    super(Command, self).run_from_argv(argv)
  File "/home/jocelyn/.virtualenvs/gevent3/lib/python3.4/site-packages/django/core/management/base.py", line 360, in run_from_argv
    connections.close_all()
  File "/home/jocelyn/.virtualenvs/gevent3/lib/python3.4/site-packages/django/db/utils.py", line 235, in close_all
    connection.close()
  File "/home/jocelyn/.virtualenvs/gevent3/lib/python3.4/site-packages/django/db/backends/base/base.py", line 263, in close
    self.validate_thread_sharing()
  File "/home/jocelyn/.virtualenvs/gevent3/lib/python3.4/site-packages/django/db/backends/base/base.py", line 523, in validate_thread_sharing
    % (self.alias, self._thread_ident, thread.get_ident()))
django.db.utils.DatabaseError: DatabaseWrapper objects created in a thread can only be used in that same thread. The object with alias 'default' was created in thread id 140001273534208 and this is thread id 140001196547568.

That's caused by the gevent monkey-patch_all() of the threading, one suggested solution is not to patch threading :

 gevent.monkey.patch_all(socket=True, dns=True, time=True, select=True,thread=False, os=True, ssl=True, httplib=False, aggressive=True)

This suggestion seems fine to be but as I'm not expert at all with gevent, I prefer to ask before submiting patch : would this theoretically break slimta ?

Encode messages as quoted printable

Hi Ian!

I´m having an issue with python slimta about message encoding. Unfortunately the most part of antispam like spamassassin understand that messages sent using base64 are classifieds as spam message. We tried to use the method encode_7bit to force to encode the message as quoted_printable but the slimtas insists to send as base64.

There is another way to setup the header to sent the messages as quoted_printable?

Python slimta is sent like bellow

--===============3378800549023565627==
Content-Type: text/plain; charset="utf-8"
MIME-Version: 1.0
Content-Transfer-Encoding: base64

JiM4MjAzOyYjODIwMzsNDQpDYXNvIG4mIzIyNztvIGVzdGVqYSB2aXN1YWxpemFuZG8gY29ycmV0
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--===============3378800549023565627==
Content-Type: text/html; charset="utf-8"
MIME-Version: 1.0
Content-Transfer-Encoding: base64

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We want that slimta sends like this

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N=C3=A3o sei quem testou, mas chegou no Gmail e no Hotmail na entrada

=20

Oi, LuisAntonio.net, Bol, Netfly, etc na caixa de entrada

=20

=20

=20

De: MailerWeb [mailto:[email protected]] Em nome =
de MailerWeb
Enviada em: ter=C3=A7a-feira, 18 de fevereiro de 2014 12:32
Para: Hotmail
Assunto: Ficou mais f=C3=A1cil falar com os clientes

=20


  =
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62e72db5_1208.gif> Caso n=C3=A3o esteja visualizando corretamente esta =
mensagem, acesse aqui. =
<https://painel.mailerweb.com.br/view/522d4f0670cba96b62e72db5_1208/>=20

=09

 <http://www.mailerweb.com.br/> Mailerweb


 <http://www.mailerweb.com.br/> Ficou f=C3=A1cil voc=C3=AA falar com =
seus clientes! T=C3=A1 esperando o qu=C3=AA? Voc=C3=AA n=C3=A3o tem nada =
a perder. =C3=89 de gra=C3=A7a!


 <http://www.mailerweb.com.br/> Clique aqui e assine gr=C3=A1tis


 <http://www.mailerweb.com.br/> Mailerweb =C3=A9 um sistema de email =
marketing completo para envio de campanhas e com recursos integrados =
para uma perfeita an=C3=A1lise de resultados.


 <http://www.mailerweb.com.br/> Veja como =C3=A9 f=C3=A1cil usar o =
Mailerweb. Acesse: www.mailerweb.com.br


Este e-mail foi enviado para [email protected]. Se =
voc=C3=AA n=C3=A3o deseja mais receber nossos e-mails, cancele sua =
inscri=C3=A7=C3=A3o aqui. =
<https://painel.mailerweb.com.br/contacts/contact/opt_out/522d4f0670cba96=
b62e72db5_1208/>=20

=20


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    margin:70.85pt 3.0cm 70.85pt 3.0cm;}
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<o:shapedefaults v:ext=3D"edit" spidmax=3D"1026" />
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<o:idmap v:ext=3D"edit" data=3D"1" />
</o:shapelayout></xml><![endif]--></head><body lang=3DPT-BR link=3Dblue =
vlink=3Dpurple><div class=3DWordSection1><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";color:#26262=
6'>N=C3=A3o sei quem testou, mas chegou no Gmail e no Hotmail na =
entrada<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";color:#26262=
6'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";color:#26262=
6'>Oi, LuisAntonio.net, Bol, Netfly, etc na caixa de =
entrada<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";color:#26262=
6'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";color:#26262=
6'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";color:#26262=
6'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><b><span =
style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif"'>De:</span></=
b><span style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif"'> =
MailerWeb [mailto:[email protected]] <b>Em nome de =
</b>MailerWeb<br><b>Enviada em:</b> ter=C3=A7a-feira, 18 de fevereiro de =
2014 12:32<br><b>Para:</b> Hotmail<br><b>Assunto:</b> Ficou mais =
f=C3=A1cil falar com os clientes<o:p></o:p></span></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><div align=3Dcenter><table =
class=3DMsoNormalTable border=3D0 cellspacing=3D0 cellpadding=3D0 =
width=3D650 style=3D'width:487.5pt'><tr><td style=3D'padding:7.5pt 0cm =
7.5pt 0cm'><p class=3DMsoNormal align=3Dcenter =
style=3D'text-align:center'><img width=3D1 height=3D1 =
id=3D"_x0000_i1025" =
src=3D"https://painel.mailerweb.com.br/campaigns/campaign/flag/522d4f0670=
cba96b62e72db5_1208.gif"><span =
style=3D'font-size:7.0pt;font-family:"Arial","sans-serif";color:#333333'>=
Caso n=C3=A3o esteja visualizando corretamente esta mensagem, <a =
href=3D"https://painel.mailerweb.com.br/view/522d4f0670cba96b62e72db5_120=
8/">acesse aqui.</a><o:p></o:p></span></p></td></tr><tr><td =
style=3D'padding:0cm 0cm 0cm 0cm'></td></tr><tr><td style=3D'padding:0cm =
0cm 0cm 0cm'><p class=3DMsoNormal><a =
href=3D"http://www.mailerweb.com.br/"><span =
style=3D'text-decoration:none'><img border=3D0 width=3D650 =
id=3D"_x0000_i1026" =
src=3D"http://images.mailerweb.com.br/campanha-15-04-13/img/campanha3-log=
o.jpg" alt=3DMailerweb></span></a><o:p></o:p></p></td></tr><tr><td =
style=3D'padding:0cm 0cm 0cm 0cm'><p class=3DMsoNormal><a =
href=3D"http://www.mailerweb.com.br/"><span =
style=3D'text-decoration:none'><img border=3D0 width=3D649 =
id=3D"_x0000_i1027" =
src=3D"http://images.mailerweb.com.br/campanha-15-04-13/img/campanha3-msg=
.jpg" alt=3D"Ficou f=C3=A1cil voc=C3=AA falar com seus clientes! T=C3=A1 =
esperando o qu=C3=AA? Voc=C3=AA n=C3=A3o tem nada a perder. =C3=89 de =
gra=C3=A7a!"></span></a><o:p></o:p></p></td></tr><tr><td =
style=3D'padding:0cm 0cm 0cm 0cm'><p class=3DMsoNormal><a =
href=3D"http://www.mailerweb.com.br/"><span =
style=3D'text-decoration:none'><img border=3D0 width=3D649 =
id=3D"_x0000_i1028" =
src=3D"http://images.mailerweb.com.br/campanha-15-04-13/img/campanha3-bot=
ao.jpg" alt=3D"Clique aqui e assine =
gr=C3=A1tis"></span></a><o:p></o:p></p></td></tr><tr><td =
style=3D'padding:0cm 0cm 0cm 0cm'><p class=3DMsoNormal><a =
href=3D"http://www.mailerweb.com.br/"><span =
style=3D'text-decoration:none'><img border=3D0 width=3D649 =
id=3D"_x0000_i1029" =
src=3D"http://images.mailerweb.com.br/campanha-15-04-13/img/campanha3-oqe=
.jpg" alt=3D"Mailerweb =C3=A9 um sistema de email marketing completo  =
para envio de campanhas e com recursos integrados para uma perfeita =
an=C3=A1lise de resultados."></span></a><o:p></o:p></p></td></tr><tr><td =
style=3D'padding:0cm 0cm 0cm 0cm'><p class=3DMsoNormal><a =
href=3D"http://www.mailerweb.com.br/"><span =
style=3D'text-decoration:none'><img border=3D0 width=3D649 =
id=3D"_x0000_i1030" =
src=3D"http://images.mailerweb.com.br/campanha-15-04-13/img/campanha3-url=
.jpg" alt=3D"Veja como =C3=A9 f=C3=A1cil usar o Mailerweb. Acesse: =
www.mailerweb.com.br"></span></a><o:p></o:p></p></td></tr><tr><td =
style=3D'padding:7.5pt 0cm 7.5pt 0cm'><p class=3DMsoNormal =
align=3Dcenter style=3D'text-align:center'><span =
style=3D'font-size:7.0pt;font-family:"Arial","sans-serif";color:#333333'>=
Este e-mail foi enviado para <a =
href=3D"mailto:[email protected]">luis_antonio_santos@hotma=
il.com</a>. Se voc=C3=AA n=C3=A3o deseja mais receber nossos e-mails, <a =
href=3D"https://painel.mailerweb.com.br/contacts/contact/opt_out/522d4f06=
70cba96b62e72db5_1208/">cancele sua inscri=C3=A7=C3=A3o =
aqui.</a><o:p></o:p></span></p></td></tr></table></div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Calibri","sans-serif"'><o:p>&nbsp;=
</o:p></span></p></div></body></html>
------=_NextPart_000_4E1D_01CF2CC1.A3704D30--

Patch SmtpSession.HAVE_DATA to respond with the result of the handoff

Are you against replacing
reply.message = '2.6.0 Message accepted for delivery with id'
with
reply.message = '2.6.0 Message accepted for delivery with id %s' % results[0][1]?

My queue mechanism replies with a unique transaction id when i succesfully save to it, and i liked to display that in the smtp session.
Besides checking if results[0][1] is not an error or something like that, it's not used elsewhere.
I'm actually using a patched version of HAVE_DATA in production and it seems like a nice feature. I think i saw a reference to this feature somewhere around here, but i don't find it.

Fork to py3 with asyncio

https://docs.python.org/3/library/asyncio.html

Timeout problem

Hi Ian,

I've found another problem on python-slimta, this is about a timeout error like described bellow

Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/gevent/greenlet.py", line 327, in run
    result = self._run(*self.args, **self.kwargs)
  File "/usr/local/lib/python2.7/dist-packages/slimta/queue/__init__.py", line 315, in _attempt
    self.relay._attempt(envelope, attempts)
  File "/usr/local/lib/python2.7/dist-packages/slimta/relay/__init__.py", line 86, in _attempt
    return self.attempt(envelope, attempts)
  File "/usr/local/lib/python2.7/dist-packages/slimta/relay/smtp/mx.py", line 213, in attempt
    return relayer.attempt(envelope, attempts)
  File "/usr/local/lib/python2.7/dist-packages/slimta/relay/pool.py", line 93, in attempt
    return result.get()
  File "/usr/local/lib/python2.7/dist-packages/gevent/event.py", line 235, in get
    raise self._exception
Timeout: 10.0 seconds
<Greenlet at 0x168e550: <bound method Queue._attempt of <Queue at 0x14c2870>>('3eff9b8bcfca4b51b7c1f440c10202a4', <Envelope at 0x19ee850, sender=u'52bd00f04bc96314c, 0)> failed with Timeout

Do you have any what it could be?

Thanks so much!

Happy new year!

raising ConnectionLost with Connection was closed prematurely instead of showing real message

If you are mailing an e-mail to yahoo, yahoo may sometimes reply with
421 4.7.0 [TS01] Messages from x.x.x.x temporarily deferred due to user complaints - 4.16.55
during or before greeting, helo/ehlo or at any point, actually. I'd be interested in obtaining that message, because i can take different actions according to the reply. Instead, i just get an
SmtpTransientRelayError and a reply.code='421', reply.message='4.3.0 Connection was closed prematurely'.

any way of convincing StaticSmtpRelay to use a certain ip when relaying an email?

I am using slimta for a custom whitelabel transactional email platform. I am using slimta for antispam, authentication and some other taks, but i forward all the emails to a sendgrid account. I'd like to change that in the future, and deliver the emails myself. I want to create 2-3 ip pools for each customer rating (good, bad, neutral) so i can segregate my traffic on different ips, eventually based on target domain as well.
I was thinking starting one or more instances based on StaticSmtpRelay per each ip, and read the incoming mails from a distributed message queue. Is there a better solution which i'm missing?
Thanks.
btw great library.

Implement proxy protocol version 2

Replace dnspython dependency with no monkey-patching

The dnslib library may provide a better way to perform the various DNS querying needs of slimta, without relying on monkey-patching the dnspython library.

slimta-mail.py and slimta.relay.maildrop

https://github.com/icgood/python-slimta/blob/master/examples/slimta-mail.py

slimta-mail.py, line 14:

from slimta.relay.maildrop import MaildropRelay

Should probably be:

from slimta.maildroprelay import MaildropRelay

Drop mox usage

The mox library, used for unittest mocking has not been updated since 2010, so it's not the best pony for mocking IMHO. I would suggest switching to Mock, which furthermore got included into python3 batteries and is widely used.

Mox do not support python3, so this ticket is a prerequisite to #26

Add documentation around using auth in SmtpEdge

Documentation on slimta.policy and list versus generators

The slimta.policy documentation says that the apply method may:

"Optionally return a new list of Envelope objects to replace the given envelope going forward. Returning None or an empty list will keep using envelope."

It appears that apply may also return a generator instead of a list. So perhaps apply only needs to return an iterable?

Also, the slimta.policy documentation does not say that apply may modify the existing envelope in place instead of creating a new one. It might be nice to be explicit about this.

For reference, the slimta.policy documentation is here:
http://docs.slimta.org/en/latest/api/slimta.policy.html

Any way of closing the socket during a SmtpSession validation?

I can easily set reply.code = '5xx' during any part of the SmtpSession validation, but i would sometimes like to close the socket of the client connecting to my SmtpEdge as well. Is there a easy way to do this? I'm not able to find any reference to the current socket from that scope.

How to set out bound ip

I have multi ip address for send email. How to swap ip address if blacklist ip.

Handle Timeout errors

Hi!

I'm using python-slimta with some success but sometimes I get a Timeout error and I would like to handle then like a bounce. Is there a way to do that?

Error traceback:

Traceback (most recent call last):
  File "/home/rafael/prj/mailerweb/disparador/local/lib/python2.7/site-packages/gevent/greenlet.py", line 390, in run
    result = self._run(*self.args, **self.kwargs)
  File "/home/rafael/prj/mailerweb/disparador/src/python-slimta/slimta/relay/smtp/client.py", line 203, in _run
    self._connect()
  File "/home/rafael/prj/mailerweb/disparador/src/python-slimta/slimta/relay/smtp/client.py", line 76, in _connect
    self.socket = self._socket_creator(self.address)
  File "/home/rafael/prj/mailerweb/disparador/src/python-slimta/slimta/relay/smtp/client.py", line 69, in _socket_creator
    socket = create_connection(address)
  File "/home/rafael/prj/mailerweb/disparador/local/lib/python2.7/site-packages/gevent/socket.py", line 646, in create_connection
    sock.connect(sa)
  File "/home/rafael/prj/mailerweb/disparador/local/lib/python2.7/site-packages/gevent/socket.py", line 376, in connect
    wait_readwrite(sock.fileno(), event=self._rw_event)
  File "/home/rafael/prj/mailerweb/disparador/local/lib/python2.7/site-packages/gevent/socket.py", line 215, in wait_readwrite
    switch_result = get_hub().switch()
  File "/home/rafael/prj/mailerweb/disparador/local/lib/python2.7/site-packages/gevent/hub.py", line 164, in switch
    return greenlet.switch(self)
Timeout: 10.0 seconds
<SmtpRelayClient at 0x19d9550> failed with Timeout

Run CI on pull requests

I don't know how the CI works, but it seems to me a bit risky to run it only on master and not on pull requests,

@icgood would it be hard to set up ?

Timeout problem

Hi Ian,

I've found another problem on python-slimta, this is about a timeout error like described bellow

Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/gevent/greenlet.py", line 327, in run
    result = self._run(*self.args, **self.kwargs)
  File "/usr/local/lib/python2.7/dist-packages/slimta/queue/__init__.py", line 315, in _attempt
    self.relay._attempt(envelope, attempts)
  File "/usr/local/lib/python2.7/dist-packages/slimta/relay/__init__.py", line 86, in _attempt
    return self.attempt(envelope, attempts)
  File "/usr/local/lib/python2.7/dist-packages/slimta/relay/smtp/mx.py", line 213, in attempt
    return relayer.attempt(envelope, attempts)
  File "/usr/local/lib/python2.7/dist-packages/slimta/relay/pool.py", line 93, in attempt
    return result.get()
  File "/usr/local/lib/python2.7/dist-packages/gevent/event.py", line 235, in get
    raise self._exception
Timeout: 10.0 seconds
<Greenlet at 0x168e550: <bound method Queue._attempt of <Queue at 0x14c2870>>('3eff9b8bcfca4b51b7c1f440c10202a4', <Envelope at 0x19ee850, sender=u'52bd00f04bc96314c, 0)> failed with Timeout

Do you have any what it could be?

Thanks so much!

Using environment markers require recent version of setuptools

Good move to introduce env markers in 7f3b733 that's the proper way to do.

Sadly, with setuptools/pip versions from Debian jessie, using env markers fail:

$ mkvirtualenv -p /usr/bin/python3 slimta
(slimta) $ pip install -e git+https://github.com/slimta/python-slimta.git#egg=python_slimta
Obtaining python-slimta from git+https://github.com/slimta/python-slimta.git#egg=python_slimta
  Updating /home/jocelyn/.virtualenvs/yom/src/python-slimta clone
  Running setup.py (path:/home/jocelyn/.virtualenvs/yom/src/python-slimta/setup.py) egg_info for package python-slimta
    error in python-slimta setup command: Invalid environment marker: python_version <  "3.0"
    Complete output from command python setup.py egg_info:
    error in python-slimta setup command: Invalid environment marker: python_version <  "3.0"

That fixes it :

pip install -U setuptools 

But, that makes the installation a two stage process, removing the "simple as pip install" thing.

So IMHO, reverting 7f3b733 is the way, what do you think ?

The other option is to amend README.md mentioning to pip install -U pip

MxSmtpRelay.attempt behavior when no MX records exist?

I cannot tell, does MxSmtpRelay.attempt implement the below sentence of section 5 of RFC 2821?

https://www.ietf.org/rfc/rfc2821.txt

"If no MX records are found, but an A RR is found, the A RR is treated as
if it was associated with an implicit MX RR, with a preference of 0,
pointing to that host."

DBPageNotFoundError: (-30985, 'DB_PAGE_NOTFOUND: Requested page not found')

Hi,

I'm using python-slimta with memory queue and these error has happened some times. Can anyone help?

Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/gevent/greenlet.py", line 327, in run
    result = self._run(*self.args, **self.kwargs)
  File "/home/mailerweb/production/web_app/mailerweb.sender/src/slimta/slimta/queue/__init__.py", line 424, in _dequeue
    envelope, attempts = self.store.get(id)
  File "/home/mailerweb/production/web_app/mailerweb.sender/src/slimta/slimta/queue/dict.py", line 94, in get
    return self.env_db[id], meta['attempts']
  File "/usr/lib/python2.7/shelve.py", line 121, in __getitem__
    f = StringIO(self.dict[key])
  File "/usr/lib/python2.7/bsddb/__init__.py", line 270, in __getitem__
    return _DeadlockWrap(lambda: self.db[key])  # self.db[key]
  File "/usr/lib/python2.7/bsddb/dbutils.py", line 68, in DeadlockWrap
    return function(*_args, **_kwargs)
  File "/usr/lib/python2.7/bsddb/__init__.py", line 270, in <lambda>
    return _DeadlockWrap(lambda: self.db[key])  # self.db[key]
DBPageNotFoundError: (-30985, 'DB_PAGE_NOTFOUND: Requested page not found')
<Greenlet at 0x253acd0: <bound method Queue._dequeue of <Queue at 0x253aeb0>>('0f52444a795b4a8d892e9a7e7eed6d20')> failed with DBPageNotFoundError

examples/slimta-mail.py is broken

Auth has changed at 7db29ce but it seems that examples/slimta-mail.py got forgotten in the process :)

I tried to fix it quickly but it's not that simple, as there is no simple example to look at (cause this is the simple example :p).

@icgood mind to give a look at fixing it if you get some time ?

ProxyAuth

There's ProxyQueue, but no ProxyAuth. It would be a nice feature.

Regarding how to implement this, icgood said on IRC:

regarding your question about authentication.. it's not straightforward, no, but it is do-able.. what you'd do is create a new ServerMechanism whose server_attempt() method simply passes the response string through to the proxy server

It seems more complex to me: the client should know which mechanism types are available before the authentication starts.

Feature request: SmtpRequireAuthenticationValidators class

It looks like if I want to require smtp authentication, I need to subclass SmtpValidators. (I could be wrong about this).

Could slimta provide a validator class that does this by default?

I could try writing this class for you, but you might want to choose the name. And you might be more familiar with all the proper SMTP status codes to return than I am.

I believe this class would need to override handle_mail, handle_rcpt, and handle_data.

Get the queue size from Queue Class

Hi!

I'm trying to get the queue size from Queue Class using the get_info method as bellow:

#queue_storage created by queue_storage = DictStorage()
#queue created by queue = Queue(queue_storage, relay, backoff=exponential_backoff)

info = queue.store.get_info()

But trying to access get_info method an error occur:

AttributeError: 'DictStorage' object has no attribute 'get_info'

So, how is the best way to get size of the queue, where the get_info is not disposed as said the documentation: http://slimta.org/latest/api/slimta.queue.html?highlight=size?

Thanks so much!

Rogério Carrasqueira

Use destination info in bounce messages

The body of generated bounce messages offers template fields to give the source host and port information, but RFC 3464 2.3.5. indicates that the Remote-MTA field should be the destination host and port. Add these as new fields, leaving the existing ones for backwards-compatibility, and update the default bounce templates to use the new fields.

When gevent.Timeout hits at times, execution seems to drop dead in it's tracks

I'm having a very hard time tracking this one down, as I'm not sure how in the world this is even happening. When a connection times out, this is what happens in the traceback, and my function that was calling $relay.attempt() just stops, even though I have it in a try/except clause. Can you spare any information as to how I can debug this further? I'll of course provide a patch!

[2013-05-03 18:00:18,326: WARNING/MainProcess] Traceback (most recent call last):
[2013-05-03 18:00:18,326: WARNING/MainProcess] File "/opt/emag/.virtualenvs/emag/src/gevent/gevent/greenlet.py", line 333, in run
[2013-05-03 18:00:18,326: WARNING/MainProcess] result = self._run(_self.args, *_self.kwargs)
[2013-05-03 18:00:18,327: WARNING/MainProcess] File "/opt/emag/lib/python-slimta/slimta/relay/smtp/client.py", line 202, in _run
[2013-05-03 18:00:18,327: WARNING/MainProcess] self._connect()
[2013-05-03 18:00:18,327: WARNING/MainProcess] File "/opt/emag/lib/python-slimta/slimta/relay/smtp/client.py", line 76, in _connect
[2013-05-03 18:00:18,327: WARNING/MainProcess] self.socket = self._socket_creator(self.address)
[2013-05-03 18:00:18,327: WARNING/MainProcess] File "/opt/emag/lib/python-slimta/slimta/relay/smtp/client.py", line 69, in _socket_creator
[2013-05-03 18:00:18,327: WARNING/MainProcess] socket = create_connection(address)
[2013-05-03 18:00:18,327: WARNING/MainProcess] File "/opt/emag/.virtualenvs/emag/src/gevent/gevent/socket.py", line 579, in create_connection
[2013-05-03 18:00:18,328: WARNING/MainProcess] sock.connect(sa)
[2013-05-03 18:00:18,328: WARNING/MainProcess] File "/opt/emag/.virtualenvs/emag/src/gevent/gevent/socket.py", line 347, in connect
[2013-05-03 18:00:18,328: WARNING/MainProcess] self._wait(self._write_event)
[2013-05-03 18:00:18,328: WARNING/MainProcess] File "/opt/emag/.virtualenvs/emag/src/gevent/gevent/socket.py", line 298, in _wait
[2013-05-03 18:00:18,328: WARNING/MainProcess] self.hub.wait(watcher)
[2013-05-03 18:00:18,328: WARNING/MainProcess] File "/opt/emag/.virtualenvs/emag/src/gevent/gevent/hub.py", line 341, in wait
[2013-05-03 18:00:18,329: WARNING/MainProcess] result = waiter.get()
[2013-05-03 18:00:18,329: WARNING/MainProcess] File "/opt/emag/.virtualenvs/emag/src/gevent/gevent/hub.py", line 568, in get
[2013-05-03 18:00:18,329: WARNING/MainProcess] return self.hub.switch()
[2013-05-03 18:00:18,329: WARNING/MainProcess] File "/opt/emag/.virtualenvs/emag/src/gevent/gevent/hub.py", line 331, in switch
[2013-05-03 18:00:18,329: WARNING/MainProcess] return greenlet.switch(self)
[2013-05-03 18:00:18,329: WARNING/MainProcess] Timeout: 20.0 seconds

new dns resolver doesn't work with pypy

i've already posted it here, saghul/pycares#21, but in case you might ever find this relevant.

Relay results as a dict

Rather than returning relay results as a sequence that maps 1-1 to the envelope.recipients field, just return it as a dict where the key is the recipient and the value is the relay result.

StaticSmtpRelay does not seem to care about connect_timeout or command_timeout

I've sent an email to a colleague's email server using a StaticSmtpRelay, and i've receive this traceback

Traceback (most recent call last):
  File "debug_slowconn/1.py", line 20, in <module>
    mx.attempt(new_envelope, 0)
  File "/root/venv_smtpout/site-packages/slimta/relay/smtp/mx.py", line 220, in attempt
    return relayer.attempt(envelope, attempts)
  File "/root/venv_smtpout/site-packages/slimta/relay/pool.py", line 93, in attempt
    return result.get()
  File "/root/venv_smtpout/site-packages/gevent/event.py", line 294, in get
    return self.get(block=False)
  File "/root/venv_smtpout/site-packages/gevent/event.py", line 273, in get
    return self._raise_exception()
  File "/root/venv_smtpout/site-packages/gevent/event.py", line 254, in _raise_exception
    reraise(*self.exc_info)
  File "/root/venv_smtpout/site-packages/gevent/_util_py2.py", line 8, in reraise
    raise type, value, tb
SmtpTransientRelayError: Transient failure on [unknown command]: 421 4.3.0 Connection was closed prematurely

The culprit seems to be in slimta/smtp/io.py in raw_recv, in the second raise ConnectionLost(). The destination MX is accepting my SMTP connection, but it doesn't greet me until it can resolve my reverse ip, so the connection hangs for 20-21 seconds. After that, i get a nice greeting from exim and i could carry on. Unfortunately, slimta hangs and dies. Have you managed to get this error in production? May this be signaling a bigger bug?

RelayPolicy example + doc

core code comes with 3 QueuePolicy examples, but no RelayPolicy example. Moreover, what the RelayPolicy should return is not documented.

Feature request: Authentication for outbound SMTP

I'd like to use python-slimta to route outbound mail via a "smart host". The smart host will, of course, want me to authenticate before it will accept the email I am trying to send. An API to enable me to install a username+password "provider" into an SMTP Relay would be nice. Ideally, the Relay would show the "provider" the outbound email (ie, the envelope), and then the "provider" would provide the username and password the Relay should use to authenticate with the smart host.

Evaluate usefulness of Reply.command attribute

reversed when select mechanisms

the get_available_mechanisms method of slimta.smtp.auth.Auth(line:135) is reversed

How to save Queue and retry send email again.

HI,I want save queue if in case bounce and retry send email 5 times, If retry send 5 times and bounce remove queue.

Abstract out buffered sockets from smtp module

A text-based buffered socket might be useful. Basically implement BufferedSocket:

• Read-until byte(s), defaulting to br'\r?\n'
• Use bytearray?
• EdgeServerBuffered, which converts replaces socket with buffered_socket
  • The ProxyProtocolV1 mix-in should be re-worked to take advantage if isinstance(socket, BufferedSocket)

Python3 support, why not ?

Hi, simple question to wonder about why Python3 is not supported,

• is there any blocking reason (like a dependency not being available for python3) ?
• is it just the fact that it's using some python2-specific idioms ? (which can be fixed in reasonable time, the project being well covered with tests)

Thanks by advance.