<p></p>
<h3 dir="auto">URL</h3>
<p dir="auto"><em>No response</em></p>
<h3 dir="auto">How to reproduce the issue?</h3>
<ol dir="auto">
<li>OSM user <code class="notranslate">usera</code> leaves a private message to OSM user <code class="notranslate">userb</code>.</li>
<li><code class="notranslate">userb</code> receives an email message from OSM with the content of the message that <code class="notranslate">usera</code> sent</li>
<li><code class="notranslate">userb</code> replies using email client to the message, email client send the email to <code class="notranslate">usera <m-dddd-cccc@messages.openstreetmap.org></code>. The email is successfully sent, as reported by MTA.</li>
<li><code class="notranslate">usera</code> never receives the message. <code class="notranslate">userb</code> never sees their message in the outbox on OSM web site.</li>
</ol>
<h3 dir="auto">Screenshot(s) or anything else?</h3>
<p dir="auto">I have unsuccessfully tried to reproduce the issue locally, by hand-crafting the email content and piping it to <code class="notranslate">script/deliver-message</code>.</p>
<p dir="auto">Here are the headers of one reply message as sent by the email client (some portions are replaced with word "redacted")</p>
<pre class="notranslate"><code class="notranslate">Date: Fri, 05 Jan 2024 12:51:42 +0100
From: <redacted>
To: redacted <m-1155857-VpmyK4S3@messages.openstreetmap.org>
Subject: Re: [OpenStreetMap] <redacted>
User-Agent: K-9 Mail for Android
In-Reply-To: <redacted>
References: <6597e31f6a8d9_20882e1a902757c4@spike-01.openstreetmap.org.mail> <redacted>
Message-ID: <001551C3-090C-4D7F-ABE0-D489222AD88E@redacted>
MIME-Version: 1.0
Content-Type: text/plain;
 charset=utf-8
Content-Transfer-Encoding: quoted-printable

body
</code></pre>

<p style="font-size:small;-webkit-text-size-adjust:none;color:#666;">—<br />Reply to this email directly, <a href="https://github.com/openstreetmap/openstreetmap-website/issues/4460">view it on GitHub</a>, or <a href="https://github.com/notifications/unsubscribe-auth/AAK2OLLBZKVT5TZRXQUCBTDYNA2ODAVCNFSM6AAAAABBOXTMRGVHI2DSMVQWIX3LMV43ASLTON2WKOZSGA3DONZWGAZDAMQ">unsubscribe</a>.<br />You are receiving this because you are subscribed to this thread.<img src="https://github.com/notifications/beacon/AAK2OLNUF6HDA3POGWBY2T3YNA2ODA5CNFSM6AAAAABBOXTMRGWGG33NNVSW45C7OR4XAZNFJFZXG5LFVJRW63LNMVXHIX3JMTHHWP4EJI.gif" height="1" width="1" alt="" /><span style="color: transparent; font-size: 0; display: none; visibility: hidden; overflow: hidden; opacity: 0; width: 0; height: 0; max-width: 0; max-height: 0; mso-hide: all">Message ID: <span><openstreetmap/openstreetmap-website/issues/4460</span><span>@</span><span>github</span><span>.</span><span>com></span></span></p>
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