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SMTP server - Incorrect IP address stamped on outgoing email

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I have a computer with 2 static IP addresses on the NIC card.

On this computer, I am running Windows 2008 Server R2.

Each IP address is used for two different, unrelated businesses/websites.

In the set up of each virtual SMTP server, I specify which IP address to use, so that a reverse lookup will show that the outgoing emails match the domain with the IP address.

However, ALL emails are being stamped with the lowest IP address listed in the GUI for the NIC.

The following fixes do not work:

DisableSocketPooling changed doesn't work

My DNS and PTR records are set up correctly.

In short, something is stamping or inserting the incorrect IP address.

Please help!

Thanks


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