IIS and SMTP - Virtual SMTP servers on different IPs send from base IP

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Author Virtual SMTP servers on different IPs send from base IP
Yi

2004-10-06, 5:54 pm

In an effort to prevent blocking by AOL when sending email
from client domains, we recently attempted to set up a
second SMTP virtual server on a Win3K server and bound it
to an IP different from the root IP of the server.

Emails were sent our via different virtual SMTP server. We
confirmed through the logs that the second SMTP virtual
server was picking up the mail and sending it.

Only problem is, when we inspect the received headers of
the emails going out, they look like:

Received: from mailer.<clientdomain>.com
(<ourserver>.<ourdomain>.com
[xxx.xxx.xxx.xxx]) by rly-yi01.mx.aol.com (v97.10) with
ESMTP id ...

where the IP address in the header is the root IP of the
server, not the IP address assigned to the SMTP virtual
server.

I wonder how we can config the virtual smtp server so the
the IP assigned to it will appear in the email head. And
is there no way to prevent the "unmasking" of the actual
server the client domain's sitting on?

TIA,

Yi
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