Error: smtplib SMTP Server Disconnected

What's Causing This Error?

This error occurs when an issue persists with the SMTP configurations in the Python script. For example, if you use TLS and do not use port 587, you may run into this error.

Solution - Here's How To Resolve It

To resolve the error, you must go through your SMTP configuration and ensure that the variables mentioned below are valid.

1. SMTP Host.
2. SMTP Port - 465, 25, 587.
3. SMTP Protocol - Use SSL if you use Port 465. Use TLS if you use Port 25 or 587.
4. Username and Password.

Verify the SMTP host, port, and protocol by going through the SMTP provider's documentation.