Ok after a year of using linux in production and 2 years of use, ive still not got to doing a mail server. Now Im kindly wondering if any of you have got loactions of decent how to? just only two things, it needs to be sufficantly secure and i must be able to integrate in to a active directory domain(as in give all ad users a mail account acording to username, as long as the mail server is able to use pam modules).