Multiple PTR records for multiple domains

L1nuxn00b703 · 12-18-2012, 09:22 PM

Hi all,

I'm wondering if BIND works with reverse lookups for Email delivery? we send out emails for a few different sites (abc.com, def.com, 123.com, 456.com), and we are having an issue with one company whose firewall software doesn't accept our emails unless the domain has a reverse lookup of 456.com (but the other domains needs reverse lookup of abc.com, etc).

I know its not recommended to configure a PTR with multiple domains but is there any way to make this work??

Thanks.

jmc1987 · 12-18-2012, 10:05 PM

Typical email servers just need the main ip to have reverse dns pointing to the host server. Another words if my server hostname was server1.server0.com and my email is emaildomain1.com But my mail server is configured to deliver mail through the main server ip aka the hostname than you only need 1 ptr pointing to your host name.

So another words what ever IP your mail server is configured to deliver mail on needs the ptr.

L1nuxn00b703 · 12-18-2012, 11:33 PM

thanks jmc1987!
So in other words, if send out mail out of IP address 1.2.3.4 and the PTR is configured as abc.com, this will work?

jmc1987 · 12-19-2012, 01:49 AM

Basically yes, assuming your ptr is resolving to the server.