The Python standard library includes a basic SMTP server in the smtpd module,
based on the old asynchronous libraries asyncore and asynchat. These modules
are quite old and are definitely showing their age; asyncore and asynchat are
difficult APIs to work with, understand, extend, and fix.

With the introduction of the asyncio module in Python 3.4, a much better way of
doing asynchronous I/O is now available. It seems obvious that an asyncio-based
version of the SMTP and related protocols are needed for Python 3. This project
brings together several highly experienced Python developers collaborating on
this reimplementation.

This package provides such an implementation of both the SMTP and LMTP protocols.