626Part VRunning (Web hosts) Servers11.Install and start Qpopper if you
626Part VRunning Servers11.Install and start Qpopper if you want to provide POP3 access: # apt-get install qpopperIf desired, you can also enable IMAP support by installing uw-imapd package. 12.If any client machines are going to be relaying messages through your server, add their IP addresses to /etc/mail/accessand run makein the /etc/maildirectory to update the database. This change does not require that youreload the sendmail configuration. The default /etc/mail/accessfile contains REJECTsettings for a number of IPaddress blocks. These addresses are not assigned to any networks right now butare sometimes abused by spammers. From time to time, one of these addressblocks is assigned to a regional IP address registry and then further divided amongnetworks. When this happens, your server will continue to reject mail from thoseaddresses. You can find a list of these networks at http://cymru.com/Bogons/ index.html. If you don t have time to check the list regularly for removals, thenyou may want to remove the entries now. You now have a fully functioning mail server that you can access from any standardmail client. Installing and Running PostfixPostfix (http://postfix.org/) was created by Wietse Venema as a replacementfor sendmail. It was designed to be fast, easy to administer, and secure. It was alsodesigned to behave similarly enough to sendmail that existing users would be ableto switch without needing to make any major changes to other programs. Maildrop (http://flounder.net/~mrsam/maildrop/) is the local MDA for theCourier mail system and is also available as a standalone package. It can be config- ured to sort messages based on rules that are specified on a system-wide or per-userlevel and is used in this example configuration to run messages through SpamAssassinand ClamAV and then move them to a Trash folder if either filter identifies them asundesirable. Courier-IMAP (http://courier-mta.org/imap/), like maildrop, is a part of theCourier mail system and is also available as a separate package. Follow these steps to install and configure the needed software: 1.Install the Postfix and maildrop packages: # apt-get install postfix postfix-doc maildropCautionNote33_
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