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Advanced Topic 35 of 50 Computer Networks

Email Protocols

SMTP, IMAP and POP3 for sending and retrieving mail.

How it works

SMTP sends mail between servers; IMAP keeps mail on the server and syncs clients; POP3 downloads and usually removes it. SPF, DKIM and DMARC authenticate senders.

Where it is used

Mail clients and servers.

Common pitfall

Plain SMTP is spoofable without sender authentication.

Where it fits in the course

Email Protocols is topic 35 of 50 in Computer Networks, rated Advanced. It follows HTTPS and TLS. The next topic is FTP and SSH.

Practice and explore

How to study this topic

  1. Read the explanation above and restate the definition in your own words.
  2. Open the interactive lesson and answer its mini quiz.
  3. Read the common pitfall, then write a short example that avoids it.
  4. Check your understanding in the Computer Networks quiz, and revisit the topic if you miss a question.

Frequently asked questions

What is Email Protocols?
SMTP, IMAP and POP3 for sending and retrieving mail. It belongs to Computer Networks and is an advanced-level topic.
Where do people use Email Protocols?
Mail clients and servers.
What is the most common mistake with Email Protocols?
Plain SMTP is spoofable without sender authentication.
What should I learn before this topic?
Start with HTTPS and TLS, the topic just before it in Computer Networks.
How can I practice it?
Answer the mini quiz in the interactive lesson, then take the Computer Networks quiz.
Is Email Protocols hard to learn?
It is an Advanced topic. Expect to read the explanation more than once and to connect it with earlier topics. Working through a small example by hand helps most.
How long does it take to learn Email Protocols?
Most learners can read the explanation and finish the interactive lesson in under an hour. Fluency comes from applying the idea, so plan a few short practice sessions with the quiz.
Which topics are related to Email Protocols?
HTTPS and TLS, FTP and SSH, VLANs are closely connected. The full list is in the related topics section of this page.
What should I study after Email Protocols?
Continue with FTP and SSH, the next topic in Computer Networks.

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