question regarding recommended PTR record configuration with multiple mail sites hosted on same IP

Albert Croft acroft at
Thu Feb 9 08:17:04 UTC 2006

I appologise if I waste anyone's time-I just wish to be clear on something.

I often see mentioned that there should be a PTR record set up for a 
mail server, but what is the recommendation in a case where multiple 
sites share a mail server? In other words, there exists something like 
(I can provide actual hostnames/IPs, if needed): IN A IN A IN A IN A

Should there be a PTR record for each name entry? Or just one, and if 
so, what should it refer to? I seem to recall seeing mention in an older 
copy of _DNS_and_Bind_ of some systems not behaving properly when seeing 
multiple PTR records-is this still the norm?

Thank you in advance for your time and consideration.

-Albert Croft

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