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Incoming email is blocked on Barracuda

All incoming email is blocked on Barracuda. I tried to use a gmail email to send to a email address on Exchange server. The following message is returned,

"Delivery to the following recipient failed permanently:

      john@abc.com

 Technical details of permanent failure:
 Google tried to deliver your message, but it was rejected by the server for the recipient domain abc.com by mailgate.abc.com. [xx.xx.xx.xx].

 The error that the other server returned was:
 550 No such domain at this location
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AXISHK
Asked:
AXISHK
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2 Solutions
 
stu29Commented:
Are you running the SMTP GW service?  Are you running any other services against your mail (Spam, Virus etc)?

Try to disable each of the other services one by one and see if it lets mail through.  Disable your blacklist/whitelist etc .. test again until you find out what your problem is.

What do your logs say when you find the connection from gmail?
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Ahmed786Commented:
Setting has to be done from barracuda side as your internal mails are working fine but the problem is with all external emails not coming through.
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Ahmed786Commented:
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stu29Commented:
I probably should have defined that in my comment huh?? :-) .. thanks for the clarification Ahmed786
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Ahmed786Commented:
No probs.
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