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Mail wont forward to exchange server on 5.101

Ran 5.026 succecsully with no problems. 

Upgraded to 5.101 and now incoming mail wont forward to the exchange server. Log file shows:

no host name found for IP address 192.9.220.3 (thats the ip of exchange server)

T=remote_smtp defer (-53): retry time 
not reached for any host (for all incoming mail)

Added an entry in the /etc/hosts file so it can resolve to a name but no joy. Have not changed any SMTP settings as I belive all the new security features as switched off by default.

Out going mail works fine.

Any ideas anyone...?

Thanks
Bryan


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