Mastering Email System Design: SMTP, IMAP, POP3, and Beyond

Learn how mail servers work, from sending emails to handling spam and securing data! This in-depth video explores the components and architecture of mail servers, including SMTP for outgoing mail, IMAP/POP3 for retrieval, and how DNS ensures emails reach their destination. We also cover the design of scalable mail servers, spam filtering techniques, and the differences between user-facing interfaces and backend storage. If you’re curious about setting up your own mail server or diving deep into email system design, this video has you covered.

Timestamps

0:00 - Introduction: Understanding Mail Servers
1:17 - Sending an Email: SMTP and DNS Lookup
1:40 - Transporting Emails: Networks and Relay Servers
3:52 - Receiving Emails: IMAP vs POP3
6:36 - High-Level Mail Server Architecture
7:23 - SMTP Servers: Sending and Receiving Emails
8:19 - Mail Retrieval Servers: Accessing Emails with IMAP and POP3
8:52 - Mail Storage: Efficiently Handling High Volumes
10:52 - Spam and Virus Filtering: Keeping Inboxes Safe
12:07 - User Authentication: Securing Access
13:29 - Scaling and Reliability: Distributed Systems and Backups
13:54 - Security in Mail Servers: TLS, Encryption, and Access Control
14:38 - Handling Spam and Filtering Techniques
15:13 - Building Your Own Mail Server: Key Steps
15:22 - Outro: Summary and Future Topics

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