Alternatives to sendmail
Postfix ( postfix package) is an alternative MTA. Postfix attempts to be fast and easy to administer, while also being sendmail compatible enough to not upset sendmail users. Postfix has a good reputation for ease of use and security and is a drop-in replacement for sendmail . Documentation for Postfix can be found at www.postfix.org/docs.html.
Qmail is a direct competitor of Postfix and has the same objectives. By default, Qmail stores email using the maildir format as opposed to the mbox format that other MTAs use (page 632). The Qmail Web site is www.qmail.org.
The sendmail daemon is an MTA (Mail Transfer Agent). When you send a message, sendmail works with other software to get it to the proper recipients. You can set up sendmail to relay email to an SMTP server that sends the email on to its ultimate destination or you can have sendmail send email directly to the SMTP servers for the domains receiving the email. By default, sendmail stores incoming messages in the mail spool directory, /var/spool/mail .
The file that controls many aspects of how
. If you edit
, when you restart
init script generates
. The system administrator can use the
file and ordinary users can use
You can use a program such as SpamAssassin to grade and mark email as to the
Other programs that can help with email include SquirrelMail, which provides Webmail services, and Mailman, which provides mailing list support.