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<article>
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<h2>Mail Server Configuration</h2>
<b>Thu, 16 Jul 2020 08:41:14 +0200</b>
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<span style="font-size: 12pt"><b>Mail Server Configuration</b></span></p>
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<span style="font-size: 10pt">Recently I installed my mail server on 9front. Most of the time I followed the guide in the FQA, but still there are things to explain. In this document I&rsquo;ll go through the section of the FQA and annotate things.
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<span style="font-size: 10pt">Right at the beginning the FQA mentions how the executing user needs write permissions for the mailboxes. This is
If upas can&rsquo;t write the mailboxes the mail server will </span><span style="font-size: 10pt"><i>not</i></span><span style="font-size: 10pt"> accept incoming mail!
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<span style="font-size: 10pt">In my setup I can skip all DNS stuff, because I have my DNS hosted somewhere else. Make sure to add proper MX records as well as (at least) an SPF record.
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<span style="font-size: 10pt"><b>/mail/lib/smtpd.conf
</b></span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
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<span style="font-size: 10pt">To make things short, here are the necessary lines in my setup. The server handles authenticated incoming mail for sending to other providers as well as incoming mail for local accounts.
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<span style="font-size: 10pt"><tt>defaultdomain    sirjofri.de
</tt></span></p><p style="line-height: 1.2em; margin-left: 1.35in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
<span style="font-size: 10pt"><tt>norelay          on
</tt></span></p><p style="line-height: 1.2em; margin-left: 1.35in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
<span style="font-size: 10pt"><tt>verifysenderdom  on
</tt></span></p><p style="line-height: 1.2em; margin-left: 1.35in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
<span style="font-size: 10pt"><tt>saveblockedmsg   off
</tt></span></p><p style="line-height: 1.2em; margin-left: 1.35in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
<span style="font-size: 10pt"><tt>ourdomains       sirjofri.de
</tt></span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
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<span style="font-size: 10pt">Note that the server is no relay for unauthenticated/untrusted requests, it will still relay if you authenticate.
</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
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<span style="font-size: 10pt">At this point it might be a good idea to check your user password.
Use </span><span style="font-size: 10pt"><i>auth/changeuser</i></span><span style="font-size: 10pt"> to add </span><span style="font-size: 10pt"><i>Inferno/POP secrets</i></span><span style="font-size: 10pt"> to your user accounts. Use these passwords to authenticate to the smtp server.
</span></p><p style="margin-top: 0; margin-bottom: 0.17in"></p>
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<span style="font-size: 10pt"><b>/mail/lib/rewrite
</b></span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
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<span style="font-size: 10pt">The program that handles sending mail uses this file to rewrite mail addresses. This file is responsible for filtering out local mail as well as sending other mails to the mailer.
</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
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<span style="font-size: 10pt">In my setup I added three aliases:
</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
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<span style="font-size: 10pt"><tt>pOsTmAsTeR    alias postmaster
</tt></span></p><p style="line-height: 1.2em; margin-left: 1.35in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
<span style="font-size: 10pt"><tt>aBuSe         alias abuse
</tt></span></p><p style="line-height: 1.2em; margin-left: 1.35in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
<span style="font-size: 10pt"><tt>wEbMaStEr     alias webmaster
</tt></span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
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<span style="font-size: 10pt">Use regular expressions to define your domain:
</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
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<span style="font-size: 10pt"><tt>\l!(.*)                alias \1
</tt></span></p><p style="line-height: 1.2em; margin-left: 1.35in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
<span style="font-size: 10pt"><tt>\l\.sirjofri.de!(.*)   alias \1
</tt></span></p><p style="line-height: 1.2em; margin-left: 1.35in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
<span style="font-size: 10pt"><tt>sirjofri.de!(.*)       alias \1
</tt></span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
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<span style="font-size: 10pt">For translating mails I added one more rule for mail address </span><span style="font-size: 10pt"><i>tags</i></span><span style="font-size: 10pt">. These tags are in the form of </span><span style="font-size: 10pt"><i>user+tag@example.com</i></span><span style="font-size: 10pt">. Official specifications say that everything behind that “+” must be ignored, but it can be used to automatically sort incoming mail into folders. I do this, by the way, so I describe here, how.
</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
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<span style="font-size: 10pt">We need rules for those plus signs:
</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
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<span style="font-size: 10pt"><tt>\"(.+)\+(.*)\"  translate "echo &lsquo;{/bin/upas/aliasmail &rsquo;\1&rsquo;}^&rsquo;+\2&rsquo;"
</tt></span></p><p style="line-height: 1.2em; margin-left: 1.35in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
<span style="font-size: 10pt"><tt># The other translate rules are default
</tt></span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
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<span style="font-size: 10pt">For delivering local mails, I added extra rules:
</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
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<span style="font-size: 10pt"><tt>local!(.+)\+(.+)  |  "/bin/test -d /mail/box/\1/\2 \&amp;\&amp; /bin/upas/mbappend /mail/box/\1/\2 || /bin/upas/mbappend /mail/box/\1/mbox"
</tt></span></p><p style="line-height: 1.2em; margin-left: 1.35in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
<span style="font-size: 10pt"><tt>local!"(.+)+(.+)  |  "/bin/test -d /mail/box/\1/\2 \&amp;\&amp; /bin/upas/mbappend /mail/box/\1/\2 || /bin/upas/mbappend /mail/box/\1/mbox"
</tt></span></p><p style="line-height: 1.2em; margin-left: 1.35in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
<span style="font-size: 10pt"><tt># leave the other rules untouched.
</tt></span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
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<span style="font-size: 10pt">With this settings, mails to user+</span><span style="font-size: 10pt"><i>tag</i></span><span style="font-size: 10pt"> will be checked. If a mailbox folder for </span><span style="font-size: 10pt"><i>tag</i></span><span style="font-size: 10pt"> exists, mail is sent to this folder. Otherwise it is sent to the user&rsquo;s default inbox.
</span><span style="font-size: 10pt"><b>Note:</b></span><span style="font-size: 10pt">
I tested, but this </span><span style="font-size: 10pt"><i>does not work</i></span><span style="font-size: 10pt"> with aliased mail. If my aliasmail changes </span><span style="font-size: 10pt"><i>userA</i></span><span style="font-size: 10pt"> to </span><span style="font-size: 10pt"><i>userB</i></span><span style="font-size: 10pt">, mails to </span><span style="font-size: 10pt"><i>userA+tag</i></span><span style="font-size: 10pt"> will be rejected! If you know how I can make this work, feel free to send me a mail.
</span></p><p style="margin-top: 0; margin-bottom: 0.17in"></p>
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<span style="font-size: 10pt"><b>/mail/lib/names.local
</b></span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
<span style="font-size: 10pt">This file is pretty easy. Just add your alias mail addresses:
</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
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<span style="font-size: 10pt"><tt>postmaster  sirjofri
</tt></span></p><p style="line-height: 1.2em; margin-left: 1.35in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
<span style="font-size: 10pt"><tt>webmaster   sirjofri
</tt></span></p><p style="line-height: 1.2em; margin-left: 1.35in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
<span style="font-size: 10pt"><tt>abuse       sirjofri
</tt></span></p><p style="margin-top: 0; margin-bottom: 0.17in"></p>
<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
<span style="font-size: 10pt"><b>/mail/lib/remotemail
</b></span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
<p style="line-height: 1.2em; margin-left: 1.35in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
<span style="font-size: 10pt"><tt>#!/bin/rc
</tt></span></p><p style="line-height: 1.2em; margin-left: 1.35in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
<span style="font-size: 10pt"><tt>shift
</tt></span></p><p style="line-height: 1.2em; margin-left: 1.35in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
<span style="font-size: 10pt"><tt>sender=$1
</tt></span></p><p style="line-height: 1.2em; margin-left: 1.35in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
<span style="font-size: 10pt"><tt>shift
</tt></span></p><p style="line-height: 1.2em; margin-left: 1.35in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
<span style="font-size: 10pt"><tt>addr=$1
</tt></span></p><p style="line-height: 1.2em; margin-left: 1.35in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
<span style="font-size: 10pt"><tt>shift
</tt></span></p><p style="line-height: 1.2em; margin-left: 1.35in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
<span style="font-size: 10pt"><tt>fd=&lsquo;{/bin/upas/aliasmail -f $sender}
</tt></span></p><p style="line-height: 1.2em; margin-left: 1.35in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
<span style="font-size: 10pt"><tt>switch($fd){
</tt></span></p><p style="line-height: 1.2em; margin-left: 1.35in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
<span style="font-size: 10pt"><tt>case *.*
</tt></span></p><p style="line-height: 1.2em; margin-left: 1.35in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
<span style="font-size: 10pt"><tt>    ;
</tt></span></p><p style="line-height: 1.2em; margin-left: 1.35in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
<span style="font-size: 10pt"><tt>case *
</tt></span></p><p style="line-height: 1.2em; margin-left: 1.35in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
<span style="font-size: 10pt"><tt>    fd=sirjofri.de
</tt></span></p><p style="line-height: 1.2em; margin-left: 1.35in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
<span style="font-size: 10pt"><tt>}
</tt></span></p><p style="line-height: 1.2em; margin-left: 1.35in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
<span style="font-size: 10pt"><tt>exec /bin/upas/smtp -h $fd $addr $sender $*
</tt></span></p><p style="margin-top: 0; margin-bottom: 0.17in"></p>
<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
<span style="font-size: 10pt"><b>SMTP over TLS
</b></span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
<span style="font-size: 10pt">I don&rsquo;t use port 587. I use 25 for this. Mail servers relay mails to this port by default, so it makes sense.
</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
<span style="font-size: 10pt">/rc/bin/service/tcp25
</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
<p style="line-height: 1.2em; margin-left: 1.35in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
<span style="font-size: 10pt"><tt>#!/bin/rc
</tt></span></p><p style="line-height: 1.2em; margin-left: 1.35in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
<span style="font-size: 10pt"><tt>user=&lsquo;{cat /dev/user}
</tt></span></p><p style="line-height: 1.2em; margin-left: 1.35in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
<span style="font-size: 10pt"><tt>exec /bin/upas/smtpd -f -E -r -c /sys/lib/tls/cert -n $3
</tt></span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
<span style="font-size: 10pt">Don&rsquo;t forget to create your TLS certificate!
</span></p><p style="margin-top: 0; margin-bottom: 0.17in"></p>
<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
<span style="font-size: 10pt"><b>IMAP4 over TLS
</b></span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
<span style="font-size: 10pt">I did this exactly like the FQA. See there.
</span></p><p style="margin-top: 0; margin-bottom: 0.17in"></p>
<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
<span style="font-size: 10pt"><b>No.
</b></span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
<span style="font-size: 10pt">At this point I stopped. I did not configure ratfs and have no spam handling right now. It doesn&rsquo;t really matter for me, because nobody knows me and I don&rsquo;t use that mail address to register anywhere.
</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
<p style="line-height: 1.2em; margin-left: 1.00in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
<span style="font-size: 10pt">Links:
</span></p><p style="margin-top: 0; margin-bottom: 0.05in"></p>
<p style="line-height: 1.2em; margin-left: 1.35in; text-indent: 0.00in; margin-right: 1.00in; margin-top: 0; margin-bottom: 0; text-align: justify;">
<span style="font-size: 10pt">&rarr;  https://fqa.9front.org/fqa7.html#7.7
</span></p><p style="margin-top: 0; margin-bottom: 0.50in"></p>

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