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NDR's not being sent to external customers

itsupport1981
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Last Modified: 2012-05-10
Hi All,

We are having an issue at work whereby each time a message is sent from any external source (the domain can be any) to an invalid address on our domain, for example, an old email or a miss-spelling, an NDR is being created but instead of being sent to the sender, it is sitting in a queue on our server.  In the queue window, the Source for these messages is TLS and the additional information reads - The remote SMTP service does not support TLS.  

We are running MS Exchange 2003, we do use TLS however, we have a separate virtual server and connectors which has this enabled.  Can anyone suggest why this is happening?  In the Default SMTP Virtual Server TLS is definitely unchecked.

Here is a picture of the queue itself;

SMTP Server Queue
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