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Howdy.
I'm looking for a little utility (pref. NT service) that can fetch
packets on port 25 (SMTP) of the local machine and forward them to
port 25 on a different machine.
Here is my scenario:
We set up Microsofts Proxy Server 2 for use of proxy server and
firewall. We have a registered IP address for that machine. It is dual
homed with the internal IP network being 192.168.5. Behind the FW we
have an Exchange server (5 with Internet connector) that can send
email out. Incoming email (MX record) points to the firewall.
Now I need some program that can forward the mail to the Exchange
server with the private IP address. I tried a mail relay agent
(EMWAC's IMS), but the problem is that it tries to resolve the
destination domain via a DNS lookup for the MX record. Since that is
the FW it keeps sending the email to itself in a loop.
The program I'm envisioning should fetch either the email or the raw
packets from port 25 and forward it to the Exchange server.
MS Proxy 2 has a few firewall features, however, it does not allow for
a directed conduit. All you can do is allow 25 to be open (If I'm
mistaken here, please correct me...)
I could give the Exchange server a registered IP address, keep it
behind the FW, but then I would route and we don't want to do that.
I think such a program is easily written in VB or VC. I'ld like to do
it myself, but for one I have not done any IP programming in VC, and
second, I don't want to reinvent the wheel.
If you know of an email relay agent, that does not use MX lookup (what
are the chances of that...), or a small tool to create the conduit,
please send me the references.
In hopes of a solution,
Frank
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