I'm very happy to announce the first alpha release of aiosmtpd, an asyncio-based implementation of SMTP and LMTP. http://aiosmtpd.readthedocs.org/en/latest/ https://pypi.python.org/pypi/aiosmtpd/1.0a1 This library can be used as a standalone server, or as a testing framework for applications that send email. It's inspired by several previous packages including the stdlib smtpd.py, lazr.smtptest, Benjamin Bader's aiosmtp, and submodules in GNU Mailman. This is an alpha release, so it can obviously use lots of feedback, and contributions are very much welcome. We're developing the library on GitLab; see the RTD link above for details. Brought to you by the aiosmtpd hacking cabal of Andrew Kuchling, Eric Smith, Jason Coombs, R. David Murray and myself. Our aim is to include aiosmtpd in the Python 3.6 stdlib as a better alternative to smtpd.py. Cheers, -Barry