"unrouteable mail domain" - please help

Hello. One of my clients ... www.eccc.us ... is experiencing some difficulties with the signup process for their website. Not with their programming, but with what Exim is doing...

ANY and ALL registrations that come from the following domains gets bounced with the following error:

A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:

xxxxxxxxx@aol.com
unrouteable mail domain "aol.com"
Other domains affected seem to be:
hotmail.com
yahoo.com

Can someone please tell me what is happening? I can send email to aol, hotmail and yahoo accounts regularly using Exim, but the emails generated by this script sent ONLY to thos domains do no go through... what causes...

unrouteable mail domain "aol.com"
Thanks,
Aaron

 

 

 

 

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