Python has built-in support for sending emails using SMTP protocol. The smtplib module defines an SMTP client session object that can be used to send mail to any Internet machine with an SMTP or ESMTP listener daemon. Python can be used to send an email in a variety of ways: as plain text, with an attached file, or as an HTML/Markdown-formatted email message.
There are also several third-party libraries available in the market like: EmailMessage module in Python’s standard library, EmailReplyParser - parse responses from email threads, Flanker - a parsing and validation library written in Python by Mailgun, Mailgun-py - an official and actively maintained Mailgun library for Python. Check 15 best Python Email libraries in 2022 for developers: