Qmail
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Qmail is a mail transfer agent (MTA) for Unix like operating systems. When I say MTA, naturally the question comes – what is an MTA? For that, first we need to know how internt email works.

Suppose Robert wants to send a mail to Ann. He opens his email client, enters the from field, types in the subject and matter. Once he clicks the send button, the mail is sent. Similarly Ann receives it at her mailbox. As far as they both are concerned, the system works fine, very well as desired. But behind the scenes, many small programs work together making it possible for the email to be moved from Robert’s machine to Ann’s.

MTA(Mail Transfer Agent) is the program which moves the mail from the sender’s system to the recipient’s system...