vs. A record on this list earlier and it seems as long as the A record has reverse DNS, it is OK.
nit: A records don't have PTR, IPs have PTR records.
. Regardless if they are not an exact match..
Sure, first step (I bet AOL, MSN, etc and all of Internet (hint: Imail8+ needs to be start using DNS more to DNS inbound mail) will tighten the DNS screws later) is for then big ISPs to refuse mail from IPs that don't have PTR hostnames (the actual domain name of the PTR hostname is not now important).
My server identifies itself as mail1.colony1.net but my reverse is mail.colony1.net (without the 1). Everyone seems to agree this is OK..
It's not best practice, which is:
1. to make you the PTR hostname of your outbound IP have a A record with that IP.
2. for the outbound IP, have exactly one PTR record.
If you set up multiple PTRs for one IP, DNS will return all PTRs to the querier. Nobody has ever been able to list for me any application that will accept all the PTRs AND process all of them to find whatever the application is looking for. When applications receive a "resource record set" as an response, they will use only the first record in the set as the answer. And the authoritative DNS (ie, the one where you enter the records) has NO control over which record will be first.
Len
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