Forward SMTP Traffic to MessageLabs

Hi,

I have a Watchguard Firebox 1000 and I want to send my outgoing SMTP mail to the MessageLabs server for virus scanning.  The firewall's outgoing SMTP traffic is currently configured from our Exchange 5.5 Server's IP address to Any. I updated the To: address from any to the MessageLabs server's IP address that they gave me. I checked my Exchange Server's outbound queue and the e-mail won't go out after I make this change. The details show host unreachable.

Susan
namylgAsked:
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BembiConnect With a Mentor CEOCommented:
This is usually not a firewall issue as more a Exchange issue. If you want to direct all outgoing mail from your Exchange server to another mail gateway (whatever it does), you have to set a "Smarthost" within your Internet Mail Connector. There is a setting "send all outgoing mails to this smarthost" (or something similar). Here you can setup the name (or IP in [brackets])  of the relay server (MessageLabs in this case), otherwise exchange will make a DNS lookup to find the target server.
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