Dear friends ! I have installed SuSe Email server II for my enterprise . which will act as the gateway mail server for all the subdomains . I have a registered domain www.abcd.com. My email gateway is webmail.abcd.com. The email addresses of users in this server are xyz@abcd.com I have 4 subdomains region1.abcd.com email addr xyz1@region1.abcd.com region2.abcd.com email addr xyz2@region2.abcd.com and so on region3.abcd.com region4.abcd.com all thes 4 subdomains have an MSexchange server5.5 at their end. In my suse email server where do i add these subdomains . in the postfix configuration there ia a column for 1.name of the relay host: 2.Local domains : what do i enter in these two columns could some one explain me in relation to my example . secondly i want the mail going outside to have the same email address as the user is alloted and not to masqurade it with abcd.com. i have found some options in post fix expert as masquerade_domains and masquerade_exceptions .can i achieve my goal using these two parameters . Regards .. neeraj