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 and SMTP error codes (RFC 3463)
The structure of SMTP status codes is as follows:
class . subject . detail
For example, when you see status code 450, it means the following:
- Class 4 indicates that it is a temporary problem
- Subject 5 indicates that it is a mail delivery status
- Detail 0 indicates an undefined error (RFC 3463)
The following table lists the various classes:
|
Status code |
Meaning |
Reason |
|
2.x.xxx |
Success |
Operation succeeded. |
|
4.x.xxx |
Persistent transient failure |
A temporary condition has prevented the server from sending the message. It may be due to server load or a network bottleneck. Usually, sending the message again will succeed. |
|
5.x.xxx |
Permanent failure |
A permanent problem prevented the ... |
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