I have a Windows web server (Server-B) that currently has DNS and mail handled by someone else. Let's say the domain is allparts.com I also have a linux server (Server-A) running ISPConfig, CentOS, Postfix and Dovecot (Perfect Server) that handles my other domains. Let's say the domain here is myshop.com What I want to do is change the nameservers at my domain registrar to point allparts.com to Server-A's name servers and set up mail on Server-A for allparts.com users to use. Basically, I want to dump the virtual hosting I am using for Server-B and do it all on Server-A. I can't eliminate Server-B because the web apps I run there are only Windows based. I know how to handle changing the nameservers. What I am unsure of is getting the email configured so users can send and receive email since the web server is not located on Server-A and the allparts.com users don't have accounts on Server-A. Hopefully, all of this makes sense... Can someone sketch out what I need to do? Thanks!