Bounce message help - how to fix?

[skypanther]

A client hosted here sends out email newsletters with a php mailer script. Nearly all of his newsletters are rejected from selected domains. Here's a sample bounce message:

<<< 452 4.2.1 Your host 204.10.105.220 has no DNS record . 
If you are  using a firewall please configure DNS and try again authoritative 
host  not found: targetaddress@domain.com
<targetaddress@domain.com>... 
Deferred: 452 4.2.1 Your host  204.10.105.220 has no DNS record . 
If you are using a firewall please  configure DNS and try again authoritative 
host not found:  targetaddress@domain.com
<<< 554 5.5.0 No recipients have been specified.
... while talking to mx1.optonline.net.:

He's also getting some "relaying denied" error messages that Jodo support has confirmed are due to the fact that the mailer he's using doesn't support SMTP auth. It's running on web4 (which is 204.10.105.220) and sends via php's mail() function. We're considering an upgrade version for his script that does support SMTP auth. ... But, will that solve the "no DNS" problems? It's a commercial app and I hate to tell him to pay for the new version if it's not going help him out.

I've posted a note on the vendor's forums. But response there is a lot slower than here and I'm hoping for an answer soon so we can get him back up and running.

Thanks,
Tim

 

[Stephen]

SMTP Auth will fix the no rDNS issues because ti will be going through a rDNSed mail server.

 

[skypanther]

Thanks Stephen!