Penguin
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Postfix is a lightweight MTA (unlike the old, bloated SendMail) written from the ground up to be fast and secure.

It was written by Wietse Venema, who is highly regarded in the security field and his implementation of an MTA is widely adopted in both personal and commerical environments.

Some people are put off by his personal feud with DanBerstein? and Qmail, though.

It is configured using a format similar to sendmail ("sendmail-ish") which makes it easier to migrate from sendmail to Postfix.