Smart Host

[jcurtiss]

I had, at one time, enabled a Smart Host for outgoing mail under Delivery/Advanced on the Default SMTP Virtual Server. The Smart Host is a virus/spam filter. My Exchange Server is on our internal 10.x.x.x network; the Smart Host is on our 11.x.x.x DMZ. The Exchange is NATed to 64.x.x.6, the Smart Host is NATed to 64.x.x.4.

So when I have the Exchange set to forward to the Smart Host, the internet headers (on a message sent to an external account) show that the message was received from 64.x.x.4; through the Smart Host then to the internet.

When I remove the Smart Host setting, headers should show that the message was received from 64.x.x.6; straight from the Exchange server to the internet.

The problem is that whether I have the Smart Host set or not, message headers still say the message was received from 64.x.x.4. So it appears that the Exchange server is sending mail to the Smart Host even if I haven't told it to.

Is there some place in Exchange settings other than Default SMTP Server Properties/Delivery/Advanced that deals with smart hosts?

 

[amanuel]

Dude,
this sounds like the headers point to your global/external/nat IP. give us some more info.

 

[jcurtiss]

yes, the headers show the NAT IP of the smart host, not the NAT IP of the exchange server. this is how i know that outgoing mail is still going through the smart host and not directly from the exchange server to the internet.

anyway, i figured it out:

Q: "Is there some place in Exchange settings other than Default SMTP Server Properties/Delivery/Advanced that deals with smart hosts?"

A: Yes. Administrative Groups/Routing Groups/First Routing Group/Connectors/Internet Mail SMTP Connectorroperties/General-)Forward All Mail through this connector to the following smart hosts

i'm not sure what exactly the thing under advanced delivery does. apparently, nothing.