Emails to AT&T Customers Not Being Received

[mvanderhoff]

Customers of our website who use AT&T are not receiving our emails.

 

We contacted AT&T and they said the server is NOT blacklisted.

 

But did a test and found this...

 

SMTP error from remote mail server after RCPT TO:: host aln-mailrelay.att.net [12.102.252.75]: 550 [PERMFAIL] att.net requires valid sender domain

 

Based on what I read here: http://rbl.att.net/block_enduser.html

 

It says this "We were unable to verify the identity of the sending system."

 

Any suggestions on how to resolve this? Is this something in my server or something in my osCommerce that I can fix.

 

Apparently it is sending from

 

<account name>@vps.<server company>.net

 

Instead of info@<website>.com

 

Thoughts? Suggestions?

 

Thanks in advance!