Comcast and Others refusing emails (No PTR Record?)
Posted on 2013-02-04
I recently installed Exchange 2007 SP1 on A server 2008 64bit Server. I also installed a Barracuda Spam Firewall 200 on the DMz. All Mail seems to be flowing fine with the exception of a few mail servers refusing our email (shown in the Barracuda Outbound queue as deferred). We use Bluehost as our Zone records holder. I have created all the A records as instructed by bluehost.
The mail servers refusing our email seem to be Comcast, AOL, Cox.net, Juno, and a couple others. I contacted Bluehost who stated that it looked like it was a Barracuda issue. So I bypassed the Barracuda for Outbound mail. Still refused by server. I contacted Comcast who confirmed that they could not verify by rDNS.
I then Contacted Bluehost again to add a PTR record. They claim that the PTR has to be setup on our internal DNS server.
I am not sure where to turn to now. I added a PTR record to our Reverse zone look up, but not sure if I did it correctly.
Can anyone tell me how to set up the PTR Record in our internal DNS to resolve the rDNS issue?
Does this look like it may resolve the issue with the PTR record?
Do I add a PTR Record for the Barracuda External IP on our internal Domain?
HELP!!! It seems like all the members of our Board of Directors use Comcast, and our executive Director is about to have my Head on a Platter.