The mail server is set up so that we can host multiple domain names with one server.  This is called <a href="http://www.sendmail.org/tips/virtualHosting">Virtual Hosting</a>.  Mailman uses the same set up.
Basically, the virtusertable is how we host multiple domain names with one mail server.
Mail comes in, goes through <code>/etc/mail/virtusertable</code> and then through <code>/etc/mail/aliases</code>.

<p>To set up an alias on moog, <b>both</b> <code>/etc/mail/virtusertable</code> and <code>/etc/mail/aliases</code> must be edited and commands need to be run.</p>

<ol>
<li>As root on moog, edit
<code>/etc/mail/virtusertable</code>
and add a section for the new alias.  For example:
<pre>
joyuen@e3s-center.org joyuen_e3s
joyuen@e3s_center.org joyuen_e3s
joyuen@e3scenter.org joyuen_e3s
</pre>
</li>
<li>Edit <code>/etc/mail/aliases</code>:
<pre>
joyuen_e3s:                  joyuen@eecs.berkeley.edu
</pre>
(See also <a href="/dopsysadmin/faq/168.html">How do I create a group mailing list on a non-workgroup site?</a>)
<br/><i>Hint:</i> Try setting up the list with yourself as
the recipient and then testing from a non-eecs gmail account.  For example:
<pre>
joyuen_e3s:                  marys@eecs.berkeley.edu
</pre>
This makes it easier to test out the email alias below.
</li>
<li>Follow the instructions at the top of the 
<code>/etc/mail/virtusertable</code>:
<pre>
cd /etc/mail
make
newaliases
/usr/bin/pkill -HUP -x -u 0 sendmail
</pre>
Note that we have to run make so that <code>/etc/mail/virtusertable</code> is combined with other files.  See <a href="/dopsysadmin/faq/192.html">Adjusting sendmail for backscatter</a>
</li>
<li>To check the alias, 
we connect to the sendmail port and use the 
<code>expn</code> command to expand the email alias.

<br/>The syntax is <code><b>expn</b> <i>emailaddress</i><b>@</b><i>host</i></code>.  The alias should be expanded.

<br/>The sendmail port is port 25.

<br/> Use <b>telnet</b> to connect to port 25:<br>
<pre>
[root@moog ~]# <b>telnet localhost 25</b>
Trying ::1...
telnet: connect to address ::1: Connection refused
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
220 moog.eecs.berkeley.edu ESMTP Sendmail 8.14.4/8.14.4; Wed, 4 Sep 2013 23:55:09 -0700
expn <b>e3sprograms@e3s-center.org</b>
250 2.1.5 &lt;lkmarlor@berkeley.edu&gt;
<b>quit</b>
221 2.0.0 moog.eecs.berkeley.edu closing connection
Connection closed by foreign host.
</pre>
If the above does not work, edit <code>/etc/mail/sendmail.cf</code>, find the line that says:
<pre>
O PrivacyOptions=authwarnings,novrfy,noexpn,restrictqrun
</pre>
remove <code>noexpn</code>, run 
<pre>
/usr/bin/pkill -HUP -x -u 0 sendmail
</pre>
and retry the telnet command.
<br/><b>Important</b>: When you are done, edit <code>sendmail.cf</code> and add <code>noexpn</code> back and rerun <code>/usr/bin/pkill -HUP -x -u 0 sendmail</code>
</li>

<li>The try sending joyuen@e3s-center.org email 
<b>from a non-UCB gmail account</b> because email sent
to yourself is not delivered.  See 
<a href="http://www.terraswarm.org/terraswarm/faq/70.html">Email to mailing lists is not received by the sender</a>.
</li>

<li>If you set up the alias to point to your account:
<ol>
  <li> Change <code>/etc/mail/aliases</code> to point to the proper people, 
  <li> Run <code>newaliases</code>
  <li> Verify that the alias works using telnet.
  <li> Send email to the alias asking that they let you
  know if they received the email
</ol>
</ol>

<p>Note that for <code>@truststc.org</code> aliases, 
<code>virtusertable</code> should use <b><code>@trust.eecs.berkeley.edu</code></b>.  I'm not sure why, but this was probably because trust.eecs was a cname in DNS instead of a MX and A record.  Or, trust was not included in the sendmail.cw file.
<br/> For example:</p>
<pre>
reu-info@trust.eecs.berkeley.edu                %1_trust
securit-info@trust.eecs.berkeley.edu            %1_trust
wise-info@trust.eecs.berkeley.edu               %1_trust
</pre>