Multi-IP Machine - Mail Server Issue

Dear HC.
We have a single Machine with IIS and Merak 8.x.x installed. We also have HC setup to point to a local mail server.

IIS runs on x.x.x.22
We have Merak bound to x.x.y.3

notice that the class C (third and fourth octets in IP address ARE DIFFERENT).

What we notice is that HC sets the mail server IP as x.x.x.22 instead of x.x.y.3

Is there a way to override this? We run our mail and IIS services on DIFFERENT Network Interfaces attached to different switches in our facility.

Any advice you might have.

OH, we also use Simple DNS 3.6.x

Please check what ips has set for these registry keys [MailServersInfo] & [DNSServer] at H_KEY_LOCAL_MACHINE--->Softwares--->Advanced Communications--->Nt Web Hosting Controller-->Mail.