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This document will teach you how to set up a basic Postfix mail server with IMAP and POP3 services. It does not included advanced topics such as integrating virus-checking and spam-filtering, which are dealt with in PostfixVirtualMailBoxClamSmtpHowto and PostfixCompleteVirtualMailSystemHowto . In our setup, Postfix sends and receives mail from Internet and stores them in the user mailboxes while clients on the Internet can retrieve their mails via Courier IMAP or POP3. The user authentication is done by Courier Authdaemon. The following diagram shows this process.
How can I search multiple Maildirs for strings all at once? ¶ Use <tt>grep</tt> or others. Mutt doesn't support a recursive search. Or use Mairix.
Configuring Debian for Maildir is not too hard, it's just hard to find out how. It's not the Debian default and there are no debconf prompts or alternatives that let you do it. Be aware that when you change to using Maildir, some stuff will break. The mbox '/var/spool/mail' based delivery is so ingrained in Unix history that many utilities (like the "you have mail" notification) just cannot understand anything else. However, the speed and reliability benefits to IMAP usually make it worthwhile.
Warning People who go to the trouble of installing Postfix may have the expectation that Postfix is more secure than some other mailers. The Cyrus SASL library contains a lot of code.
Enabling SMTP authentication in Postfix ensures that only users with valid accounts can send email outside your network (relaying). This prevents spammers from using your SMTP server as a spam broadcast station. Here’s how to do it in Postfix. If you are using Red Hat Enterprise Linux 5 or CentOS 5, please read Postfix SMTP Authentication and Dovecot SASL instead. It’s a lot easier to setup and you won’t have to duplicate your Dovecot authentication setup into SASL.