Postfix
Check configuration postconf -n /etc/postfix/virtual # In order to translate any mailbox address from one domain to a mapped user on another domain add the following entries: # account1@olddomain.ext account1 # account2@olddomain.ext account2 # newdomain.ext DOMAIN # @newdomain.ext @olddomain.ext # this will ensure that account1@olddomain.ext AND account1@newdomain.ext is delivered to account1 and account2@[newdomain or olddomain].ext goes to account2 # After changing this file run # postmap virtual Catchalls are set up with @domain.ext userid /etc/postfix/virtual-domains # This file contains the domains for which postfix will accept email # It's not a hash file, so no need to run postmap on it. To accept messages in the mailqueue and defer them untill the primary MX server is up again, add the domain.ext to /etc/postfix/relay-domains and in transport add domain.ext etrn-only: The mail will then be delivered when sendmail -q is sent, or when telnet mailserver 25, helo originating.domain etrn defermaildomain.ext mails get defered - you can see them in mailq also in /var/spool/postfix/flush/ (see also http://lists.freebsd.org/pipermail/freebsd-questions/2006-February/112246.html http://www.postfix.org/ETRN_README.html http://archives.neohapsis.com/archives/postfix/2001-07/0730.html) postfix reload reloads the config http://wiki.ev-15.com/debian:mail_system for how to set up squirrelmail and cyrus for IMAP with postfix
You can also force the queue delivery by running
postqueue -f
or deliver a specific message by
postsuper -r queue_id
You can see the structure of the queues by using
qshape
you can see the active / incoming / deferred / hold queues by doing
qshape deferred
you may have to wait a bit for the output though.
To kill all deferred messages in the queue you can use
postsuper -d ALL deferred
An example from http://sysop.com.cn/document/Postfix.The.Definitive.Guide/0596002122_postfix-chp-5-sect-2.html
Example 5-1. Perl script to delete queued messages by email address #!/usr/bin/perl -w # # pfdel - deletes message containing specified address from # Postfix queue. Matches either sender or recipient address. # # Usage: pfdel <email_address> # use strict; # Change these paths if necessary. my $LISTQ = "/usr/sbin/postqueue -p"; my $POSTSUPER = "/usr/sbin/postsuper"; my $email_addr = ""; my $qid = ""; my $euid = $>; if ( @ARGV != 1 ) { die "Usage: pfdel <email_address>\n"; } else { $email_addr = $ARGV[0]; } if ( $euid != 0 ) { die "You must be root to delete queue files.\n"; } open(QUEUE, "$LISTQ |") || die "Can't get pipe to $LISTQ: $!\n"; my $entry = <QUEUE>; # skip single header line $/ = ""; # Rest of queue entries print on # multiple lines. while ( $entry = <QUEUE> ) { if ( $entry =~ / $email_addr$/m ) { ($qid) = split(/\s+/, $entry, 2); $qid =~ s/[\*\!]//; next unless ($qid); # # Execute postsuper -d with the queue id. # postsuper provides feedback when it deletes # messages. Let its output go through. # if ( system($POSTSUPER, "-d", $qid) != 0 ) { # If postsuper has a problem, bail. die "Error executing $POSTSUPER: error " . "code " . ($?/256) . "\n"; } } } close(QUEUE); if (! $qid ) { die "No messages with the address <$email_addr> " . "found in queue.\n"; } exit 0;
Postgrey is a greylister that rejects email from a server on the first try, using the fact that most spammers do not retry to send their email, whereas almost all normal mail servers do.