March 2018
Intermediate to advanced
626 pages
17h 32m
English
book
Network Analysis Using Wireshark 2 Cookbook - Second Edition
by Nagendra Kumar Nainar, Yoram Orzach, Yogesh Ramdoss
Content preview from Network Analysis Using Wireshark 2 Cookbook - Second Edition
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SMTP communications
SMTP is commonly used for the following purposes:
- Server to server communications, in which SMTP is the mail protocol that runs between the servers
- In some clients, POP3 or IMAP4 are configured for incoming messages (messages from the server to the client), while SMTP is configured for outgoing messages (messages from the client to the server)
The normal behavior of SMTP communication is as follows:
- The local email client resolves the IP address of the configured SMTP server address.
- This triggers a TCP connection to port number 25 if SSL/TLS is not enabled. If SSL/TLS is enabled, a TCP connection is established over port 465.
- It exchanges SMTP messages to authenticate with the server. The client sends AUTH LOGIN to ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.