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<title>Email | dn42 wiki</title>

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<b>dn42 wiki / Email</b>

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            <p>Running email in dn42 is not very complicated.  Your SMTP daemon probably already listens on the wildcard address, so you mostly need to:</p>

<ul>
  <li>open your firewall to allow TCP/25 from dn42</li>
  <li>setup DNS (MX records, or simply relevant A records)</li>
  <li>configure your mail server if needed</li>
</ul>

<h2 id="redirect">Redirect</h2>
<p><del>There are forwarding rules for <em>PERSON</em> @ dn42.org to the mail addresses which have been given in the registry. Please note that the trailing <code class="language-plaintext highlighter-rouge">-DN42</code> is stripped from the local part.</del></p>

<h3 id="example">Example</h3>

<table>
  <thead>
    <tr>
      <th style="text-align: left">Handle</th>
      <th style="text-align: left">Alias</th>
      <th style="text-align: left">Redirection</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td style="text-align: left"><code class="language-plaintext highlighter-rouge">STV0G-DN42</code></td>
      <td style="text-align: left">stv0g@dn42.org</td>
      <td style="text-align: left"><code class="language-plaintext highlighter-rouge">post@steffenvogel.de</code></td>
    </tr>
  </tbody>
</table>

<h2 id="test-email">Test email</h2>

<p><del>Send an email to <code class="language-plaintext highlighter-rouge">test@evenet.dn42</code> to check if your mail setup is correct.</del> This host will reply using the following
sieve filter:</p>

<div class="language-conf highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="n">require</span> [<span class="s2">"regex"</span>, <span class="s2">"variables"</span>, <span class="s2">"vacation-seconds"</span>];
<span class="n">if</span> <span class="n">header</span> :<span class="n">contains</span> <span class="s2">"To"</span> [<span class="s2">"test@evenet.dn42"</span>] {
  <span class="n">if</span> <span class="n">header</span> :<span class="n">matches</span> <span class="s2">"Subject"</span> <span class="s2">"*"</span> {
      <span class="n">set</span> <span class="s2">"subject_was"</span> <span class="s2">": ${1}"</span>;
  }
  <span class="n">vacation</span> :<span class="n">addresses</span> [<span class="s2">"test@evenet.dn42"</span>] :<span class="n">seconds</span> <span class="m">60</span> :<span class="n">subject</span>  <span class="s2">"Re: ${subject_was}"</span> <span class="s2">"Your dn42 email setup works!"</span>;
}
</code></pre></div></div>

<h2 id="exim-tips">Exim tips</h2>

<h3 id="sending-emails">Sending emails</h3>

<p>By default on Debian, Exim refuses to send mail to other mailservers when they resolve to RFC1918 addresses.  This will manifest by the following error message when trying to send a mail:</p>

<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>** foo@bar.dn42: all relevant MX records point to non-existent hosts
</code></pre></div></div>

<p>This is controlled by the <code class="language-plaintext highlighter-rouge">ignore_target_hosts</code> variable in the configuration file.</p>

<h3 id="receiving-emails">Receiving emails</h3>

<p>Don’t forget to add your dn42 domains to the list of local domains, so that you accept incoming emails.  On Debian, it is controlled by <code class="language-plaintext highlighter-rouge">dc_other_hostnames</code> in <code class="language-plaintext highlighter-rouge">update-exim4.conf.conf</code>.  For instance:</p>
<div class="language-conf highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="n">dc_other_hostnames</span>=<span class="s1">'myself.org;myself.dn42;myserver.myself.dn42'</span>
</code></pre></div></div>

<h2 id="postfix">Postfix</h2>

<h3 id="sending-mails">Sending Mails</h3>
<p>If your machine sends/receives Mails in “clearnet” with specific bound IP’s you need to create an additional transport in master.cf</p>

<div class="language-conf highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="n">out_dn42</span>  <span class="n">unix</span> -       -       <span class="n">n</span>       -       -       <span class="n">smtp</span>
    -<span class="n">o</span> <span class="n">smtp_bind_address</span>=<span class="m">172</span>.<span class="m">23</span>.<span class="m">67</span>.<span class="m">1</span>
    -<span class="n">o</span> <span class="n">smtp_bind_address6</span>=<span class="n">fd70</span>:<span class="m">96</span><span class="n">c9</span>:<span class="n">ef25</span>::<span class="m">1</span>
    -<span class="n">o</span> <span class="n">smtp_helo_name</span>=<span class="n">ns1</span>.<span class="n">mhm</span>.<span class="n">dn42</span>
    -<span class="n">o</span> <span class="n">syslog_name</span>=<span class="n">postfix</span>-<span class="n">dn42</span>
</code></pre></div></div>

<p>and add this transport to /etc/postfix/transport for dn42 (and dont forget to postmap)</p>

<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>.dn42           out_dn42:
</code></pre></div></div>

<p>This should to the trick for sending mails via your DN42-IP</p>

<p>If you use <code class="language-plaintext highlighter-rouge">smtpd_recipient_restrictions</code> you can use the following rule to white-list dn42 as sender.
This can circumvent certain rdns configuration failure or in case you use rbl lists:</p>

<div class="language-conf highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="n">smtpd_recipient_restrictions</span> = <span class="n">permit_mynetworks</span>,
                         <span class="n">permit_sasl_authenticated</span>,
                         <span class="n">check_client_access</span> <span class="n">cidr</span>:/<span class="n">etc</span>/<span class="n">postfix</span>/<span class="n">dn42</span>.<span class="n">cidr</span>,
                         <span class="n">reject_non_fqdn_sender</span>,
                         <span class="c"># ...
</span>                         <span class="n">permit</span>
</code></pre></div></div>

<div class="language-conf highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="c">#/etc/postfix/dn42.cidr
</span><span class="m">172</span>.<span class="m">16</span>.<span class="m">0</span>.<span class="m">0</span>/<span class="m">12</span> <span class="n">OK</span>
<span class="m">10</span>.<span class="m">0</span>.<span class="m">0</span>.<span class="m">0</span>/<span class="m">8</span> <span class="n">OK</span>
<span class="n">fc00</span>::/<span class="m">7</span> <span class="n">OK</span>
</code></pre></div></div>

<div class="language-sh highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nv">$ </span>postmap /etc/postfix/dn42.cidr
</code></pre></div></div>

<h3 id="receiving-emails-1">Receiving emails</h3>

<p>The Domain mails should be received for has to be added to <code class="language-plaintext highlighter-rouge">mydestination =</code> in main.cf</p>

<h2 id="new-smtp-rfc-smtputf8">New SMTP RFC SMTPUTF8</h2>
<h3 id="eai">EAI</h3>
<p>Email Address Internationalization (EAI) as defined in <a href="http://tools.ietf.org/html/rfc6531">RFC 6531</a> (SMTPUTF8 extension), <a href="http://tools.ietf.org/html/rfc6532">RFC 6532</a> (Internationalized email headers) and <a href="http://tools.ietf.org/html/rfc6533">RFC 6533</a> (Internationalized delivery status notifications).</p>
<h3 id="postfix-1">Postfix</h3>
<p>Introduced with Postfix version 3.0, this fully supports UTF-8 email addresses and UTF-8 message header values.
more at the <a href="http://www.postfix.org/SMTPUTF8_README.html">SMTPUTF8_README</a>.</p>
<h3 id="exim">Exim</h3>
<p>Watch Exims EAI Tracker <a href="http://bugs.exim.org/show_bug.cgi?id=1177">Bug 1177</a></p>


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