Difference between revisions of "Postfix Local Mail"

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[[Category:Networking (English)]]
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#REDIRECT [[Postfix]]
[[Category:HOWTOs (English)]]
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==Postfix How To: Local Host-only mail delivery==
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==What is postfix?==
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Well, I think the postfix website gives a good enough definition for our purposes.
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"Postfix attempts to be fast, easy to administer, and secure, while at the same
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time being sendmail compatible enough to not upset existing users. Thus, the
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outside has a sendmail-ish flavor, but the inside is completely different."
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-- http://www.postfix.org/
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==Goals==
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The goal of this how to is to setup postfix for local mailbox delivery only.
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===Required packages:===
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*postfix
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==Postfix Installation==
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===Step 1: Install Postfix===
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[root@computer]# pacman -Sy postfix
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===Step 2: Check /etc/passwd, /etc/group===
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Make sure that the following shows up in /etc/passwd
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postfix:x:73:73::/var/spool/postfix:/bin/false
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Make sure that the following shows up in /etc/group
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postdrop:x:75:
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postfix:x:73:
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Note: Postfix can be made to run in a chroot. This document does not currently cover this. Might be added later.
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==Postfix Configuration==
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===Step 1: Edit /etc/postfix/main.cf===
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The only things you need to change are as follows. Uncomment them and modify them to the specifics listed below. Everything else can be left as installed by pacman.
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inet_interfaces = loopback-only
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mynetworks_style = host
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append_dot_mydomain = no
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default_transport = error: Local delivery only!
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If you want to control where the mail gets delivered and which mailbox format is to be used, you can do this by setting
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home_mailbox = /some/path
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or
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mail_spool_directory some/path
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''mail_spool_directory'' is an absolute path where all mail goes, while ''home_mailbox'' specifies a mailbox relative to the user's home directory. If the path ends with a slash ('/'), messages are stored in Maildir format (direcory tree, one message per file); if it doesn't, the mbox format is used (all mail in one file).
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Examples:
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mail_spool_directory = /var/mail  (1)
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home_mailbox = Maildir/          (2)
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1) All mail will be stored in /var/mail, mbox format
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2) Mail will be saved in ~/Maildir, Maildir format
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===Step 2: Edit /etc/rc.conf===
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Add postfix to the daemons list. Make sure you put it after the network has started.
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===Step 3: Edit /etc/postfix/aliases===
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Namely, put a username in for the the following, substituting the correct username you desire (actual system account required) for USER
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# Person who should get root's mail. Don't receive mail as root!
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root:          USER
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Run the following command. This creates the map file that postfix understands.
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postalias /etc/postfix/aliases
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In addition, create .forward in /root with the contents of the user you want to forward all root mail to:
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eg USER@localhost
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===Step 4: Start the daemon===
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postfix check
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If '''postfix check''' returns no errors, then start the daemon.
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/etc/rc.d/postfix start
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Check /var/log/mail.log for any errors.
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===Step 5: Test===
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Try sending an email. Even from yourself to yourself should be a good test.
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mail -s test user
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this is a test email.
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.
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Now check your mail using whatever client you desire.
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===Step 6: Test some more!===
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Make sure root mail forwards to the desired user; use the same test as above, but substitute root for user.
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Latest revision as of 03:06, 14 November 2012

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