MX record and PTR questions

[Bill Larson]

On Jun 21, 2005, at 12:37 PM, Stephane Bortzmeyer wrote:

>> Also if my server was called server1 - would the reverse PTR have to
>> read server1.domain.com.au or the name specified in the MX record
>> (in the first case mail.domaim.com.au)
>
> The DNS and BIND do not care. But some servers test that there is a
> consistency between the PTR and the A.

I have found the following link to be useful in how PTR records are 
used.  See http://www.dnscentral.com/help/reversednschecking.html.  
Take a look.

PTR records may be used by mail servers.  It also seems that SSH may 
use this DNS information also.  Reverse DNS isn't required for any 
purpose, but may be used.  Consistency of information between forward 
and reverse DNS will never cause you problems, but missing or 
inconsistent information may cause problems.

Bill Larson