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Mail delivery failed: returning message to sender

Posted on 2015-01-21
Medium Priority
Last Modified: 2015-02-07
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:

    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.
Question by:chillsdja
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LVL 59

Expert Comment

by:Cliff Galiher
ID: 40563013
You seem to have left out the message and its headers...

Expert Comment

ID: 40563221
You can try by increasing the time out Set-ReceiveConnector for ConnectionInactivityTimeout on other side, also try disabling ESMTP feature on CISCO.
LVL 19

Expert Comment

ID: 40563654
Does your spam filter able to nslookup the customer email domain?

Accepted Solution

chillsdja earned 0 total points
ID: 40584716
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

Author Closing Comment

ID: 40595421
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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