FreeBSD Postfix Maildrop

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Contents

Overview

Maildrop is a replacement local mail delivery agent, similar to procmail but with more features. It has support for LDAP lookups, mail filtering, mailbox quota and support for virtual mail acounts making it convenient to use in a black box kind of setup without any real accounts.

The main benefit of using "maildrop" is for the quota feature withut mucking around file system quota. Quotas can be imposed on both the mailbox size and on the number of individual mails.

NOTE: This quota mechanism will only work as long as maildrop (or deliverquota) are the only applications that deliver messages to the maildir, or as long as other applications implement the same quota enforcement mechanism. See maildirquota(7)

This setup described here is for a standard mail server with user home directories and real accounts.

The Setup

  1. Install Postfix and configure it to use "maildrop" as LMTP
  2. Install Maildrop with ~/Maildir support
  3. Create ~/Maildir with quota enabled using "maildirmake -q"

Package Install

  • Install the following packages 
root# portinstall mail/postfix
root# portinstall mail/maildrop WITH_MAILDIRQUOTA=yes

Maildrop + Maildir

While compiling maildrop, make sure that the delivery format is set to "./Maildir". The default is to deliver to /var/mail/$USER. This is not runtime cofigurable and has to be done by adding the following line to maildrop/config.h before the port compile in the port directory. 

#define DEFAULT_DEF "./Maildir"

See http://www.flounder.net/~mrsam/maildrop/INSTALL.html for details

  • Configure Postfix to use "maildrop" instead of procmail is the default LMTP. 
# use maildrop as LMTP
mailbox_command = /usr/local/bin/maildrop
local_destination_concurrency_limit = 1

[godzilla] ~> postconf |grep maildrop
mailbox_command = /usr/local/bin/maildrop

Creating ~/Maildirs

  • To create a Maildir for $USER with quota (10MB and/or 1000 mails) 
root# cd /home/$USER
root# maildirmake -q 10000000S,1000C ./Maildir

See maildirmake(1) and maildirquota(7)

Testing Delivery 

root# echo | mail -s "Testing maildrop delivery" $USER

/var/log/maillog 

May 21 17:39:40 godzilla postfix/pickup[75916]: 14D05B57E: uid=0 from=<root>
May 21 17:39:40 godzilla postfix/cleanup[75922]: 14D05B57E: message-id=<20030521120940.14D05B57E@godzilla.mydomain.com>
May 21 17:39:40 godzilla postfix/qmgr[75917]: 14D05B57E: from=<root@godzilla.mydomain.com>, size=340, nrcpt=1 (queue active)
May 21 12:09:40 godzilla postfix/smtpd[75925]: connect from localhost.mydomain.com[127.0.0.1]
May 21 12:09:40 godzilla postfix/smtpd[75925]: 39E36B57D: client=localhost.mydomain.com[127.0.0.1]
May 21 17:39:40 godzilla postfix/cleanup[75922]: 39E36B57D: message-id=<20030521120940.14D05B57E@godzilla.mydomain.com>
May 21 17:39:40 godzilla postfix/qmgr[75917]: 39E36B57D: from=<root@godzilla.mydomain.com>, size=820, nrcpt=1 (queue active)
May 21 12:09:40 godzilla postfix/smtpd[75925]: disconnect from localhost.mydomain.com[127.0.0.1]
May 21 12:09:40 godzilla postfix/lmtp[75924]: 14D05B57E: to=<shanu@godzilla.mydomain.com>, orig_to=<shanu>, relay=127.0.0.1[127.0.0.1], delay=0, status=sent (250 2.6.0 Ok, id=41157-03-2, from MTA: 250 Ok: queued as 39E36B57D)
May 21 17:39:40 godzilla postfix/local[75926]: 39E36B57D: to=<shanu@godzilla.mydomain.com>, relay=local, delay=0, status=sent ("|/usr/local/bin/maildrop")

Over quota delivery 

May 21 08:19:35 godzilla postfix/lmtp[41373]: 7981EB578: to=<shanu@godzilla.mydomain.com>, orig_to=<shanu>, relay=127.0.0.1[127.0.0.1], delay=1, status=sent (250
 2.6.0 Ok, id=41226-01, from MTA: 250 Ok: queued as 6AB55B577)
May 21 13:49:35 godzilla postfix/local[41345]: 6AB55B577: to=<shanu@godzilla.mydomain.com>, relay=local, delay=0, status=bounced (permission denied. Command outp
ut: maildrop: maildir over quota. )

Quota Warning Message

  • Turn on warning messages in maildrop 
mailbox_command = /usr/local/bin/maildrop -w 50
  • Create the /usr/local/etc/quotawarnmsg file 
[godzilla] ~# cat /usr/local/etc/quotawarnmsg
From: Mail Delivery System <postmaster@godzilla.mydomain.com>
Reply-To: postmaster@godzilla.mydomain.com
To: Valued Customer:;
Subject: Mail quota warning
Mime-Version: 1.0
Content-Type: text/plain; charset=iso-8859-1
Content-Transfer-Encoding: 7bit

Your mailbox on the server is now more than 90% full.
So that you can continue to receive mail you need to
remove some messages from your mailbox.

Not getting any warning messages? Check whether any quota has actually been
imposed on the Maildir (~/Maildir/maildirsize) and also check for the presence
of ~/Maildir/quotawarn file. Warnings are sent once in 24 hours.

ToDo

  • Hook it upto LDAP so that I can have LDAP based quota settings
  • Figure out whether I can have vacation/auto responders using maildrop. Qmail sure makes this feature extremely convenient and easy to use.

Resources

  • RH7.1 > Postfix > Maildrop > Courier IMAP - How-I-did-it:

http://www.firstpr.com.au/web-mail/RH71-Postfix-Courier-Maildrop-IMAP/

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