Reverse DNS and mail

Mike DiChiappari mdichiappari at
Thu Jan 8 04:09:18 UTC 2004

> There is no requirements that the mailserver has several FQDN, it's
> better to have each domain have an MX record to
> the "one-and-only" real mailserver

Yes, but our mail server could appear as or, depending on
who is sending email (we host both and  So wouldn't a
recipient mail client want's IP address to resolve to and's IP address to resolve to  Conversely, wouldn't an email
client that does reverse DNS reject email where's IP address
resolves as

Another way to ask this is that if and have the same IP, how
does one guarantee that upon reverse DNS lookup that joe at's IP
address resolve to  Maybe DNS will return

> Same goes with the nameservers for the zones, there is no
> point in faking separate names of the nameservers just to
> have them coincidence with the domain itself. In fact it's
> far less work to have fewer glue-records to keep up to date.

Won't email appear to come from the same domain then?


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