Did the message that you got back have an IP address in it? Did it come from your server or from theirs?
It could be that the intended recipient's server tried to verify the senders address on the server before accepting the mail (this is RFC standard) and perhaps could not verify, meaning your server could open relay email.
Make sure your server is set up to accept bounce backs. The sound of your return message is that it's not a real bounce back, but just your own server saying it contacted the recipient server but delivery was refused.
You should Contact the recipients server people somehow with the time and date and to and from addresses of the email to see if they can check the server logs and give a definite reason. I suspect that they could.
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by: matthewspatrickPosted on 2005-06-16 at 18:39:43ID: 14236887
Hi ksair,
It could be on the recipient's end. For example, some companies set very strict controls on attachments, and routinely
bounce emails with attachments (especially with .zip and .exe extensions).
Regards,
Patrick