Jay from the Sophos Support Team walks you through the fundamentals of email. He covers the basic email flow concept, the STMP connection process, commands, status codes and an example STMP session.

Skip ahead to these sections:
00:10 Overview
01:30 SMTP Basics
02:34 Connection Process
03:23 Commands & Status Codes
06:33 Example Session

Relevant Resources:

SMTP Communication:
https://learn.microsoft.com/en-us/exchange/mail-flow/test-smtp-telnet?view=exchserver-2019

SMTP Status Codes:
https://blog.mxtoolbox.com/2011/08/30/400-500-email-bounce-back-errors-explained/

Common Technical Terms in Email:
https://www.mailgun.com/resources/learn/glossary/mail-transfer-agent/#:~:text=A%20Mail%20Transfer%20Agent%20(MTA,to%20access%20or%20send%20emails.

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