Solution Title: Configure Multiple IP addresses for SMTP

I would like to setup an SMTP server for bulk mailing that will allow me to send emails from different IP addresses. Currently, my company sends emails out for several divisions within our company. The problem is that one division or another will send out an email blast that will cause a block on AOL. The result is that all of our divisions suffer when AOL blocks a specific IP. So, I have setup multiple virtual SMTP servers and have successfully sent email out of specific virtual servers. However, when I look at the SMTP headers I still see the first IP line in the header points to my default IP address for the server sending the emails. The next couple lines do refer to the virtual SMTP server but I am afraid that because the default IP address appears first I will be blocked no matter how many virtual servers I setup. I know there must be a solution because hosting companies do not suffer from the same problem our divisions do and the hosting companies obviously server hundreds of users from the same server.

Yi Zhang - did you get this sorted? I believe the problem is to do with socket pooling (I am trying to do the same as you for the same reasons). I am running a Windows 2003 server and have been unable to switch of socket pooling for SMTP.

Did you resolve this?