Deleting CNAME Question

[yanks2112]

Hi All,

I have a mail server that is running behind a Symantec Firewall that does NATing. This is posing some problems with sending email. The problem is when an email is sent, the public ip of the outside interface is used in the HELO greeting. This ip is different than my mail servers public ip and PTR records, so some spam filters are rejecting our emails. My DNS looks something like this:

A Record: abc.123.com
mail.123.com CNAME abc.123.com
MX abc.123.com



What would like to do is delete the CNAME for mail.123.com and create an A record for that this way my clients will not to be reconfigures and (if timed right) wont even know the difference. Are there any pitfalls to look out for? Am I missing something or is a CNAME is what it is and Alias



Thanks for your help



PS The reason why I am looking to do this is so I can exempt my internal mail server from NATing so that the correct name and IP address will appear in the HELO greeting

 

[monsterjta]

From what it looks like...nobody will know the difference if you delete that CNAME record, as long as your clients are configured to point to your A record abc.123.com.

Hope This Helps,

Good Luck!

 

[yanks2112]

Thanks, monsterja that is what I thought I just wanted to double check before I made any changes