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
The normal operation of SMTP is as follows:
- The email client resolves the IP address of the SMTP server:
- The client opens a TCP connection to the SMTP server on port 25 when SSL/TSL is not enabled. If SSL is enabled, the client will open the session on port 465:
- Upon successful TCP session establishment, the client will send an AUTH LOGIN message to prompt with the account username/password.
- The username and password will be sent to the SMTP client for account verification.
- SMTP will send a response code of 235 if authentication ...
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