mail-builder is a flexible e-mail builder library written in Rust. It includes the following features:
- Generates e-mail messages conforming to the Internet Message Format standard (RFC 5322).
- Full MIME support (RFC 2045 - 2049) with automatic selection of the most optimal encoding for each message body part.
- Fast Base64 encoding based on Chromium's decoder (the fastest non-SIMD encoder).
- Minimal dependencies.
Please note that this library does not support sending or parsing e-mail messages as these functionalities are provided by the crates mail-send and mail-parser.
Build a simple e-mail message with a text body and one attachment:
// Build a simple text message with a single attachment
let eml = MessageBuilder::new()
.from(("John Doe", "[email protected]"))
.to("[email protected]")
.subject("Hello, world!")
.text_body("Message contents go here.")
.attachment("image/png", "image.png", [1, 2, 3, 4].as_ref())
.write_to_string()
.unwrap();
// Print raw message
println!("{}", eml);More complex messages with grouped addresses, inline parts and multipart/alternative sections can also be easily built:
// Build a multipart message with text and HTML bodies,
// inline parts and attachments.
MessageBuilder::new()
.from(("John Doe", "[email protected]"))
// To recipients
.to(vec![
("Antoine de Saint-Exupéry", "[email protected]"),
("안녕하세요 세계", "[email protected]"),
("Xin chào", "[email protected]"),
])
// BCC recipients using grouped addresses
.bcc(vec![
(
"My Group",
vec![
("ASCII name", "[email protected]"),
("ハロー・ワールド", "[email protected]"),
("áéíóú", "[email protected]"),
("Γειά σου Κόσμε", "[email protected]"),
],
),
(
"Another Group",
vec![
("שלום עולם", "[email protected]"),
("ñandú come ñoquis", "[email protected]"),
("Recipient", "[email protected]"),
],
),
])
// Set RFC and custom headers
.subject("Testing multipart messages")
.in_reply_to(vec!["message-id-1", "message-id-2"])
.header("List-Archive", URL::new("http://example.com/archive"))
// Set HTML and plain text bodies
.text_body("This is the text body!\n")
.html_body("<p>HTML body with <img src=\"cid:my-image\"/>!</p>")
// Include an embedded image as an inline part
.inline("image/png", "cid:my-image", [0, 1, 2, 3, 4, 5].as_ref())
.attachment("text/plain", "my fíle.txt", "Attachment contents go here.")
// Add text and binary attachments
.attachment(
"text/plain",
"ハロー・ワールド",
b"Binary contents go here.".as_ref(),
)
// Write the message to a file
.write_to(File::create("message.eml").unwrap())
.unwrap();Nested MIME body structures can be created using the body method:
// Build a nested multipart message
MessageBuilder::new()
.from(Address::new_address("John Doe".into(), "[email protected]"))
.to(Address::new_address("Jane Doe".into(), "[email protected]"))
.subject("Nested multipart message")
// Define the nested MIME body structure
.body(MimePart::new(
"multipart/mixed",
vec![
MimePart::new("text/plain", "Part A contents go here...").inline(),
MimePart::new(
"multipart/mixed",
vec![
MimePart::new(
"multipart/alternative",
vec![
MimePart::new(
"multipart/mixed",
vec![
MimePart::new("text/plain", "Part B contents go here...").inline(),
MimePart::new(
"image/jpeg",
"Part C contents go here...".as_bytes(),
)
.inline(),
MimePart::new("text/plain", "Part D contents go here...").inline(),
],
),
MimePart::new(
"multipart/related",
vec![
MimePart::new("text/html", "Part E contents go here...").inline(),
MimePart::new(
"image/jpeg",
"Part F contents go here...".as_bytes(),
),
],
),
],
),
MimePart::new("image/jpeg", "Part G contents go here...".as_bytes())
.attachment("image_G.jpg"),
MimePart::new(
"application/x-excel",
"Part H contents go here...".as_bytes(),
),
MimePart::new(
"x-message/rfc822",
"Part J contents go here...".as_bytes(),
),
],
),
MimePart::new("text/plain", "Part K contents go here...").inline(),
],
))
// Write the message to a file
.write_to(File::create("nested-message.eml").unwrap())
.unwrap();To run the testsuite:
$ cargo test --all-featuresor, to run the testsuite with MIRI:
$ cargo +nightly miri test --all-featuresLicensed under either of
- Apache License, Version 2.0 (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
- MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT)
at your option.
Copyright (C) 2020-2022, Stalwart Labs Ltd.
See COPYING for the license.
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