ndr address from perl

I have a subscription, called say domain1.com with domain2.com as part of its subscriotion.

I am sending an email from domain2.com using perl. Most of the emails are sent OK, but some are bouncing particularly the ones going to gmail addresses.

These "bounced" emails have a couple of messages in the mail log. The 1st message shows a bounce message which I assume is produced during the message delivery between my server and google. The second message is an error that looks like a ndr. it...

ndr address from perl