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Mail delivery failed: returning message to sender

We are having an issue with email one customer

We are getting the following message

This message was created automatically by mail delivery software.

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:

  User@domain.com
    retry timeout exceeded

------ This is a copy of the message, including all the headers. ------

I can see the email pass through exchange and our spam filter and then we receive this message.

If  we use an external email (gmail) we have no issues emailing the customer.
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chillsdja
Asked:
chillsdja
1 Solution
 
Cliff GaliherCommented:
You seem to have left out the message and its headers...
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NICK SCommented:
You can try by increasing the time out Set-ReceiveConnector for ConnectionInactivityTimeout on other side, also try disabling ESMTP feature on CISCO.
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suriyaehnopCommented:
Does your spam filter able to nslookup the customer email domain?
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chillsdjaAuthor Commented:
Issue was resolved

The recipient had a rule to block any emails that appear to be an open relay and we have a cloud base spam filter to it would appear as an open relay
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chillsdjaAuthor Commented:
Issue was resolved

The recipient had a rule to block any emails that appear to be an open relay and we have a cloud base spam filter to it would appear as an open relay
0
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