Add mlmmj post.

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+[mlmmj][] is a nice, clean mailing list manager.  [[Postfix]] setup on
+[[Gentoo]] is pretty easy, following the [Postfix README][postfix].
+The following assumes you've already got Postfix working.
+
+Setup
+=====
+
+Install mlmmj:
+
+    # emerge -av mlmmj
+
+Add a `mlmmj` user, so the list doesn't have to run with `root` permissions:
+
+    # useradd -rmd /dev/null -s /sbin/nologin mlmmj
+
+Make a spool directory:
+
+    # mkdir /var/spool/mlmmj
+    # chown mlmmj.mlmmj /var/spool/mlmmj
+
+Create a mailing list (e.g. `mlmmj-test`):
+
+    # sudo mlmmj-make-ml.sh -c mlmmj:mlmmj -L mlmmj-test
+
+Use a transport map so Postfix can invoke the mlmmj executables as the
+`mlmmj` user.  In `/etc/postfix/main.cf`:
+
+    transport_maps = regexp:/var/spool/mlmmj/transport
+    mlmmj_destination_recipient_limit = 1
+
+And in `/var/spool/mlmmj/transport`, add a line for each mailing list.
+The following line maps an email regexp (`/^(mlmmj-test).*$/`) to a
+transport (`mlmmj`) with a given nexthop address (`mlmmj-test`):
+
+    /^(mlmmj-test).*$/                        mlmmj:mlmmj-test
+
+Add the referenced transport to `/etc/postfix/master.cf`:
+
+    mlmmj   unix  -       n       n       -       -       pipe
+      flags=DORhu user=mlmmj argv=/usr/bin/mlmmj-recieve -F -L /var/spool/mlmmj/$nexthop/
+
+The flags are:
+
+* `D` - Prepend a 'Delivered-To: recipient' header
+* `O` - Prepend an 'X-Original-To: recipient' header
+* `R` - Prepend a 'Return-Path:'. header
+* `h` - fold $nexthop to lowercase
+* `u` - fold $recipient to lowercase
+
+Restart Postfix:
+
+    # /etc/init.d/postfix restart
+
+Add the maintenance daemon (which will drop permissions automatically)
+to the root crontab:
+
+    0 */2 * * *  /usr/bin/mlmmj-maintd -F -d /var/spool/mlmmj
+
+Configuring the list
+====================
+
+Set custom headers:
+
+               # cat /var/spool/mlmmj/mlmmj-test/control/customheaders
+               X-Mailinglist: mlmmj-test
+               Reply-To: mlmmj-test@example.com
+
+Set custom footers:
+
+    # cat /var/spool/mlmmj/mlmmj-test/control/customfooters
+    -- 
+    To unsubscribe send a mail to mlmmj-test+unsubscribe@example.com
+
+Set a subject prefix (e.g. `Subject: [mlmmj-test] how are we doing?`)
+
+    # echo '[mlmmj-test]' > /var/spool/mlmmj/mlmmj-test/control/prefix
+
+Make a moderated list:
+
+    # touch /var/spool/mlmmj/mlmmj-test/control/moderated
+    # echo 'jack@example.com > /var/spool/mlmmj/mlmmj-test/control/moderators
+    # echo 'jill@example.com >> /var/spool/mlmmj/mlmmj-test/control/moderators
+
+Command line maintenance
+========================
+
+Subscribe users:
+
+    # mlmmj-sub -L /var/spool/mlmmj/mlmmj-test/ -a jdoe@example.com
+
+Unsubscribe users:
+
+    # mlmmj-unsub -L /var/spool/mlmmj/mlmmj-test/ -a jdoe@example.com
+
+See the other `mlmmj-*` utilities for more goodies.
+
+Email interface
+===============
+
+In the following, `listname` should be replaced by the name of the
+list.  For example, `mlmmj-test` from the examples above.
+
+* Send mail to the list at `listname@example.com`
+* Send off-list mail to the list owner at `listname+owner@example.com`
+* Send off-list mail to the list moderators at
+  `listname+moderators@example.com`
+* Subscribe with an empty email to `listname+subscribe@example.com`
+* Unsubscribe with an empty email to `listname+unsubscribe@example.com`
+* Get help on other features of mlmmj by sending an empty email to
+  `listname+help@example.com`.
+
+[mlmmj]: http://mlmmj.org/
+[postfix]: http://mlmmj.org/docs/readme-postfix/
+
+[[!tag tags/tools]]