SMTP client module. Connect to SMTP servers and send mail with it.
This module is the successor for the client part of the (now deprecated) SMTP module simplesmtp. For matching SMTP server see smtp-server.
Install with npm
npm install smtp-connection
Require in your script
var SMTPConnection = require('smtp-connection');
var connection = new SMTPConnection(options);
Where
- options defines connection data
- options.port is the port to connect to (defaults to 25 or 465)
- options.host is the hostname or IP address to connect to (defaults to 'localhost')
- options.secure defines if the connection should use SSL (if
true
) or not (iffalse
) - options.ignoreTLS turns off STARTTLS support if true
- options.requireTLS forces the client to use STARTTLS. Returns an error if upgrading the connection is not possible or fails.
- options.name optional hostname of the client, used for identifying to the server
- options.localAddress is the local interface to bind to for network connections
- options.connectionTimeout how many milliseconds to wait for the connection to establish
- options.greetingTimeout how many milliseconds to wait for the greeting after connection is established
- options.socketTimeout how many milliseconds of inactivity to allow
- options.logger optional bunyan compatible logger instance. If set to
true
then logs to console. If value is not set or isfalse
then nothing is logged - options.debug if set to true, then logs SMTP traffic, otherwise logs only transaction events
- options.lmtp if true, uses LMTP instead of SMTP to talk to the server. Partial support, does not work well with multiple recipients
- options.authMethod defines preferred authentication method, e.g. 'PLAIN'
- options.tls defines additional options to be passed to the socket constructor, e.g. {rejectUnauthorized: true}
- options.socket - existing socket to use instead of creating a new one
SMTPConnection instances are event emitters with the following events
- 'error' (err) emitted when an error occurs. Connection is closed automatically in this case.
- 'connect' emitted when the connection is established
- 'end' when the instance is destroyed
Establish the connection
connection.connect(callback)
Where
- callback is the function to run once the connection is established. The function is added as a listener to the 'connect' event.
After the connect event the connection
has the following properties:
- connection.secure - if
true
then the connection uses a TLS socket, otherwise it is using a cleartext socket. Connection can start out as cleartext but if available (orrequireTLS
is set to true) connection upgrade is tried
If the server requires authentication you can login with
connection.login(auth, callback)
Where
- auth is the authentication object
- auth.user is the username
- auth.pass is the password for the user
- auth.xoauth2 is the OAuth2 access token (preferred if both
pass
andxoauth2
values are set) or an XOAuth2 token generator object.
- callback is the callback to run once the authentication is finished. Callback has the following arguments
- err and error object if authentication failed
If a XOAuth2 token generator is used as the value for auth.xoauth2
then you do not need to set auth.user
. XOAuth2 generator generates required accessToken itself if it is missing or expired. In this case if the authentication fails, a new token is requeested and the authentication is retried. If it still fails, an error is returned.
XOAuth2 Example
var generator = require('xoauth2').createXOAuth2Generator({
user: '{username}',
clientId: '{Client ID}',
clientSecret: '{Client Secret}',
refreshToken: '{refresh-token}'
});
// listen for token updates
// you probably want to store these to a db
generator.on('token', function(token){
console.log('New token for %s: %s', token.user, token.accessToken);
});
// login
connection.login({
xoauth2: generator
}, callback);
Once the connection is authenticated (or just after connection is established if authentication is not required), you can send mail with
connection.send(envelope, message, callback)
Where
- envelope is the envelope object to use
- envelope.from is the sender address
- envelope.to is the recipient address or an array of addresses
- message is either a String, Buffer or a Stream. All newlines are converted to \r\n and all dots are escaped automatically, no need to convert anything before.
- callback is the callback to run once the sending is finished or failed. Callback has the following arguments
- err and error object if sending failed
- code string code identifying the error, for example 'EAUTH' is returned when authentication fails
- response is the last response received from the server (if the error is caused by an error response from the server)
- responseCode is the numeric response code of the
response
string (if available)
- info information object about accepted and rejected recipients
- accepted and array of accepted recipient addresses
- rejected and array of rejected recipient addresses
- response is the last response received from the server
- err and error object if sending failed
Use it for graceful disconnect
connection.quit();
Use it for less graceful disconnect
connection.close();
MIT