Help With Postfix Delivery Failure

carlosinfl · 09-05-2008, 02:19 PM

When I try to send a test email from my email server to my ISP provided email account, I get an error. I can however send to Gmail, Yahoo, and BellSouth accounts.

When I sent to my cfl.rr.com email account from my Postfix account, I get the following error:

Code:

Sep  5 15:10:53 email postfix/smtp[4021]: E0C921FA413A: to=<cwilliams200@cfl.rr.com>, relay=cdptpa-smtpin02.mail.rr.com[75.180.132.244]:25, delay=0.94, delays=0.07/0.01/0.86/0, dsn=4.0.0, status=deferred (host cdptpa-smtpin02.mail.rr.com[75.180.132.244] refused to talk to me: 451 4.7.1: Relaying temporarily denied.  Cannot resolve PTR record for xxx.xxx.xxx.134)

Where xxx.xxx.xxx.134, is my NAT IP address for my email server.

Is this a problem on my end or are they being to restrictive?

Mr. C. · 09-05-2008, 03:55 PM

The problem is on your end.

Remote MTAs want to see a valid A and PTR record for your mail server. These must be public IPs, not private RFC 1918 addresses.

carlosinfl · 09-05-2008, 04:36 PM

Yes. Thanks. I just called my ISP and made sure they had a valid PTR pointing to my servers name.domain. They did not and asked them to add it and now it works fine.

Thanks!