You should be able to convince Windows to prefer a certain gateway or interface by setting a lower metric for it:

http://www.microsoft.com/resources/documentation/windows/xp/all/proddocs/en-us/route.mspx?mfr=true 

/Rolf 

I added a new IP address to my server to host an additional service, and i natted it to additional public IP address.

Then i noticed that some mails were sent using original IP, some other using new IP !

It is possible to link MercuryS, MercuryP, MercuryI modules to a specific IP using "IP interface to use:" option, but that option seem not to be present in the MercuryE module.

Is there an option or workaround to impose SMTP end-to-end client to use a specific IP address ?

Thanks - Alex.

MercuryE is a client, not a server, so it doesn't bind to any specific IP interface. Have a look at the routing rules in Windows, though, it should be possible to set priorities for interfaces there.

/Rolf 

[quote user="Rolf Lindby"]

MercuryE is a client, not a server, so it doesn't bind to any specific IP interface. Have a look at the routing rules in Windows, though, it should be possible to set priorities for interfaces there.

/Rolf 

[/quote]

Thank you Rolf.

The problem is not so trivial, since some servers act the MX reverse to identify spammers ... so i believe important to communicate using the right IP ...

 Alex.