Differences

This shows you the differences between two versions of the page.

Link to this comparison view

security:reverse_dns_does_not_match_smtp_banner [2017/07/04 18:26]
Mohammed AlShannaq created
security:reverse_dns_does_not_match_smtp_banner [2017/07/04 18:43] (current)
Mohammed AlShannaq
Line 2: Line 2:
  
 One of the most popular email servers problem is that the "​Reverse DNS does not match SMTP Banner"​ and as system administrators we must fix this problem if we plan to run success mail server. One of the most popular email servers problem is that the "​Reverse DNS does not match SMTP Banner"​ and as system administrators we must fix this problem if we plan to run success mail server.
 +
 +If you don't know what is RDNS you can take a look to the following url [[http://​support.simpledns.com/​kb/​a45/​what-is-reverse-dns-and-do-i-need-it.aspx|What is "​reverse DNS" and do I need it?]]
 +
 +The SMTP banner is the initial SMTP connection response that a messaging server receives after it connects to mail server, ​ whose purpose is to announce the server and any information that the administrator would like to convey to the world. and it comes after when you connect to the smtp after the response 220
 +
 +In a perfect world RDNS and SMTP banner would match and/or resolve to the same Fully Qualified Domain Name (FQDN) of the server Hostname.
 +