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Email is still the backbone of professional communication, and sending emails manually is one of the most time-consuming repetitive tasks developers and businesses face. Python's built-in smtplib module lets you send emails programmatically — from simple notifications to bulk personalized messages — without any external libraries. In this complete guide, you will learn how to send emails with Python using smtplib, add attachments, create HTML-formatted emails, and build practical email automation scripts. This is an essential skill in your Python automation toolkit . How Email Works: SMTP Explained Simply SMTP (Simple Mail Transfer Protocol) is the standard protocol for sending emails across the internet. When you send an email, your email client connects to an SMTP server, authenticates your identity, and hands off the message for delivery. Python's smtplib module handles this entire process for you. Every major email provider offers SMTP access. Gmail uses smtp.gmai...