No matter what we do we cannot get our virtual SMTP servers in IIS to not reference the IP used by the primary SMTP instance. Even if the other IP is on a physically seperate NIC card. Even if the other IP is in a different subnet. When the email comes through, it has BOTH IP's on it!!?
I see that through socket-programming I can FORCE a bind to a specific IP. However, is there ANY way to do this in IIS SMTP server alone so I can have NO references to my primary IP address when the mail is sent? If socket programming can allow it to happen why can't IIS?