Two servers

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Hi !   I have two servers : One for the web and the for the mail. I want to install the Sqwebmail, so my users could get there mail from the web interface. My problem is, I don't know on which server to install the program since I haven't seen any where in the documentation how to tell the program where the mail server is. If I assume that it will use the DNS to find the mail server then I'll install it on the web server. Any hints ? Thanks in advance   Pericles