aiosmtpd - Asyncio-based SMTP Server

library 1.4.6 ·python

✓ verified May 22, 2026

http-networking communication

aiosmtpd is an asyncio-based SMTP and LMTP server, providing an asynchronous, RFC 5321 compliant server that supports customizable extensions. It serves as a modern replacement for the deprecated `smtpd` module in the Python standard library. The current version is 1.4.6, and it's actively maintained under the aio-libs umbrella project.

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Resources

docsaiosmtpd.readthedocs.io/ ↗

githubgithub.com/aio-libs/aiosmtpd ↗

packagepypi.org/project/aiosmtpd/ ↗

API endpoints

full doc /v1/registry/aiosmtpd

install /v1/registry/aiosmtpd/install

compatibility /v1/registry/aiosmtpd/compatibility