Configuring PMG

well from what i understand you need to remove the smart relay host, on transports put your domain name with the SMTP port of you zimbra and the other email server should work. I have 2 email servers different domains behind PMG
 
Well, I had to put my internal mail zimbra to deliver the mail to the PMG through port 26 and not the 25 as usual, everything is working now. Thanks people.
 

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