How to write a simple smpt server in python?

Question

Python

Hello.
Tell me how to write your own mail server in python?
Do not connect to another server (mail.ru, gmail.com, etc.), but write your own.
What libraries can be used for this? Preferably with code examples.
Thank you very much.

Answer 1

https://www.djangosnippets.org/snippets/96/
Pay attention to plugins.