postfix: postfix (mail transport and submission agent) postfix: postfix: Postfix attempts to be fast, easy to administer, and secure, while at postfix: the same time being sendmail compatible enough to not upset existing postfix: users. Thus, the outside has a sendmail-ish flavor, but the inside is postfix: completely different. postfix: postfix: Homepage: http://www.postfix.org postfix: postfix: postfix: