Signed-off-by: Malfurious <m@lfurio.us>

Signed-off-by: Malfurious <m@lfurio.us>

Add this subdomain as a hint to the user, to distinguish the specific
server hostname from the virtual domain list, which should usually only
contain second-level domain names.

Signed-off-by: Malfurious <m@lfurio.us>

Create a user mailing list under userconfig with a sane set of initial
configuration variables.  Available configuration can be found at
https://mlmmj.org/TUNABLES.html

Signed-off-by: Malfurious <m@lfurio.us>

Signed-off-by: Malfurious <m@lfurio.us>

Despite the default semantics for `InternalHosts` option in
opendkim.conf, OpenDKIM seems to generally only consider the labeled
sender of a message when deciding whether to sign a message or validate.

This means that previously, when a message was sent to a mailing list
from a domain outside of the mailnode host, the copies of this message
that the list sent out did not get a signature applied to them.

Since we will usually be injecting headers for mailing list information,
we can search these first to determine the message envelope sender.
X-Mailing-List will be the list's full address.  Sender is added just in
case.  Advice is taken from the "Mailing Lists" section of
http://www.opendkim.org/opendkim-README

Signed-off-by: Malfurious <m@lfurio.us>

Install and configure OpenDKIM according to the instructions found in
the OpenDKIM readme: http://www.opendkim.org/opendkim-README

* dkim:
  opendkim: Start milter service
  opendkim: Disable syslog
  opendkim: Configure postfix milter socket
  opendkim: Generate keys / TXT record
  opendkim: Configure signing parameters
  opendkim: Add default config file
  opendkim: Setup package and data volume

Signed-off-by: Malfurious <m@lfurio.us>

Signed-off-by: Malfurious <m@lfurio.us>

Signed-off-by: Malfurious <m@lfurio.us>