Hello Mustafa, > Sure you can define multiple POP3 virtual servers for the same IP address. > It is important the unique port and IP combination. For the first virtual > server you will have, for example, the IP address 10.10.4.1 and the only > port 110. And the second virtual server will have the same IP 10.10.4.1, > but a different port 995. This will function in each primitive > mail/messaging server. I think Exchange 2003 is not a primitive messaging > system, or is it? As I stated in my email, you can set up multiple SMTP's on the same IP provided you are prepared to use non-standard ports. So what's the big deal with using non-standard ports? Not much for POP3 as long as you know how to configure your Outlook to use a port other than 110 for POP3. But it is a MAJOR deal for SMTP. Using non-standard ports for SMTP will prevent any other mailserver from sending you email if they do not know which port to talk to your server on SMTP. Since there is no "public query, LDAP or database" or any other standard method for figuring out which SMTP port you are using (if not port 25), you will be reduced to receiving email only from those mail servers who know that you are using port 995 (or whatever port you pick) for SMTP. The sending mailserver will not automaticall figure out, somehow, that you are using port 995 unless you tell it so (by a phone call or memo to the system admin and he/she is nice enough to accommodate your non-standard port, most unlikely!). You will receive no email from hotmail, yahoo, aol, earthlink, rr, or any other mailserver who does not share knowledge of your secret port 995 and is willing to reconfigure their mailserver to send to port 995 just for you. Probably not a good thing! (This is true regardless of whether the remote sending mailserver is an Exchange server or non-Exchange Linux or other mailserver). best regards Mike