How to decode received electronics in python?

Question

Email

Hello. Please tell me how to decode an email in python?
I receive letters using smtpd.
They come in this format.

{'credential_instance': None, 'mail_options': [], 'rcpt_options': []}
Receiving message from: ('0.'0.'0.'0', 47549)
Message addressed from: [email protected]
Message addressed to  : ['[email protected]']
Message : b'Date: Sun, 01 Nov 2020 11:51:03 UT\nSubject: =?UTF-8?B?VGl0bGU==?=\nReply-To: login\nTo: "=?UTF-8?B?bG9naW4yQGxvY2FsaG9zdA==?=" <[email protected]>\nMIME-Version: 1.0\nContent-Type: text/html; charset="UTF-8"\nContent-Transfer-Encoding: 8bit\nFrom: "=?UTF-8?B?YWRtaW40QG5hZm9ydW1lLm9yZy4==?=" <login>\nX-Priority: 3\n\nText\n'

Maybe there are libraries that normally parse the Date part. What would the parser not write.