rust-smtp

SMTP (Simple Mail Transfer Protocol) implementation for Rust.

Goal

The goal of this project is to implement a RFC 5321 compliant SMTP client and server library, which hopefully will turn into a fully featured SMTP server one day. Rust is the ideal language to write such a project in, for various reasons:

1. It's a safe language. Buffer bounds checking, no memory holes, task-separation.
2. It's efficient like C/C++.
3. Light-weight threading and asynchronous I/O leads to a much simpler implementation, only using slightly more memory (for each tasks' stack) than a hand-rolled evented implementation.
4. Rust is a lot more high-level and cleaner than other comparative languages.

Making this a library makes it a lot more useful than a program, as it can be configured much easier and to a wider degree. For example the way local users are looked up can be implemented in an arbitrary way; there is no need for external lookup processes as found in OpenSMTPd. Also by using Rust and it's libraries, it is from the beginning on fully platform independent and not tied to a specific range of platforms.

Todo

• Successfully parse a simple SMTP session
• Simple SMTP proxy, no delivery, no relaying
• Support SSL
• Support local delivery (on port 587)
• Support relaying (queueing)
• Add anti-spam features

License

rust-smtp is under the BSD license, see LICENSE for details.

Copyright (c) 2014 by Michael Neumann [email protected].