`!smtpd` --- SMTP Server

This module is no longer part of the Python standard library. It was removed in Python 3.12 <whatsnew312-removed> after being deprecated in Python 3.6. The removal was decided in 594.

A possible replacement is the third-party aiosmtpd library. This library is not maintained or supported by the Python core team.

The last version of Python that provided the !smtpd module was Python 3.11.