#############
Mail Services
#############

We provide each of our members with personal emails, as well as the right to
create mailing lists through mailman_. Our organizational mailing lists
(announce, acm, officers, and admins) are all run through mailman as well.

.. _mailman: http://www.list.org/

Member Email
============

Out of a sense of tradition, our mail host is named ``centaur.vm.acm.jhu.edu``
and listens on the address mapped to ``centaur.acm.jhu.edu`` externally.  See
:ref:`enet-ingress`.

Postfix
-------

.. todo render understandable

We run Postfix as our MTA.

Blocking Domains
````````````````

The file ``/etc/postfix/access`` contains a list of domains to be rejected. At
the time of this writing, the only such domain is ``mms.att.net``, from which we
recieved a bunch of spam about six hours before the file's creation. In
postman's ``main.cf`` primary config file, you will find the line::

   smtpd_sender_restrictions = hash:/etc/postfix/access

This tells postman that in the above-mentioned file it can find a list of
domains from which it should not accept mail. To add to the list of domains, you
can just edit the file; add the domain and the word `REJECT`, as in the
``att.net`` line, then run::

   postmap hash:/etc/postfix/access
   systemctl restart postfix

Mail Volumes
------------

.. todo render understandable

.. _smtp-patch_for_afs:

Patching for AFS
````````````````

This is exciting::

  apt-get source postfix
  cd postfix-${...}
  patch -p1 < /afs/acm.jhu.edu/group/admins.pub/postfix-local-afs.diff
  dpkg-buildpkg
    # this will take a while!
  cd ..
  dpkg --install postfix-${...}

You may wish to look at
file:///afs/acm.jhu.edu/group/admins.pub/postfix-local-afs.diff before
executing these instructions to see what's going on in a bit more detail!

DNS Glue
--------

.. todo explain / reference explanation elsewhere

Mailman and the Lists
=====================

We're currently running mailman 2.1.18, which has been out of date for only a
bit less than two years as of this writing. Mailman (or at least mailman2) is
horrifically insecure and somewhat difficult to use. We should probably move to
a superior list server, but we would like to port over our archives and current
lists, which could take some doing.

.. todo finish section