Exchange 2010 can't send to internet.

Bahloul used Ask the Experts™
Hello ,

I have 2 server's Exchange 2010 CAS/HUB  Using Proof-point smart host, i can receive messages from internet but can't send to public domains such as google , and yahoo  from 2 days i send to my gmail and i didn't receive messages to my Google also i didn't receive nondelivery report  also i viewd queue viewer in exchange and and proof-point it's empty , please advice.
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if you have a firewall that is publishing your exchange, please make sure that you have a dns rule that allow dns from internal to external.


My zones are hosted to ISP .
so contact your ISP.
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Check your mail server public IP if its black listed :

Also check if there is a PTR record for mail IP on the ISP dns. (for example points to
i forgot to mention to verify if you have created a send connector to internet? be aware that send connectors are not created by default.
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If you are using a smart host and the queues are empty, then the problem is with the smart host. You need to speak to them to find out where the messages have gone.

While a PTR on your IP address is good to have, with a smart host it isn't necessary.


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