I have a client who goes through this every couple of weeks. Certain domains will get email bounced back as spam. Here's a copy of the bounce message:
From: System Administrator
Sent: Tuesday, June 24, 2008 11:04 AM
Subject: Undeliverable: Latest Requirements Doc
Your message did not reach some or all of the intended recipients.
Subject: Latest Requirements Doc
Sent: 6/24/2008 11:04 AM
The following recipient(s) cannot be reached:
lastname, firstname on 6/24/2008 11:04 AM
There was a SMTP communication problem with the recipient's email server. Please contact your system administrator.
<branch.domainname.com #5.5.0 smtp;554 Transaction Failed. Spam Message not queued.>
I had a problem in the past with my PTR record pointing to the ISP instead of the actual exchange server...but when I fixed it, I added a PTR to two places...just in case.
Reverse MX A records (PTR) Your reverse (PTR) record:
xxx.xxx.xxx.xxx.in-addr.arpa -> branch.domainname.com
xxx.xxx.xxx.xxx.in-addr.arpa -> domainname.com
the DNS pointer to the exchange server goes to what I am calling branch.domainname.com (for security reasons...not using actual domain names or ip's)
but their email addresses are firstname.lastname@example.org
HERE'S MY QUESTION:
A. Is the PTR record supposed to point to the domain name or the DNS pointer that the email is coming from?
B. Could this be causing the above error code when emailing certain domains?
Thanks in advance...please skip the guesswork and only answer if you know!