<!DOCTYPE html><html><head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body><div style="font-family: sans-serif;"><div class="markdown" style="white-space: normal;">
<p dir="auto">FWIW, I’m using an Exchange server and I have this same duplication issue on a regular basis in my Sent folder. Sometimes even more than two duplicates. I’ve just gotten used to it. The same duplicates are not there when I open Outlook or Apple Mail.</p>
</div><div id="AB58F889-B350-49E4-B60C-28AD4DAC7698">
<div class="line" style="width: 400px; height: 2px; background-color: black;"></div><br>
<b>Jeffrey W Bullard</b> PhD | FACerS | FWAS<br>
Zachry Department of Civil and Environmental Engineering<br>
Department of Materials Science and Engineering<br>
Texas A&M University<br>
3136 TAMU<br>
College Station, Texas 77843<br><br>
<div class="line" style="width: 400px; height: 2px; background-color: black;"></div></div>
<div class="markdown" style="white-space: normal;"><p dir="auto"><br>
On 3 Mar 2026, at 8:23, Henry Seiden wrote:</p>
<blockquote style="margin: 0 0 5px; padding-left: 5px; border-left: 2px solid #777777; color: #777777;">
<p dir="auto">Luis,</p>
<p dir="auto">I have not experienced the issue on my Outlook account, but it is infrequently used.</p>
<p dir="auto">Could this be caused by the settings on your server? IOW, can you see the same problem using another client (Apple Mail or Outlook Mail or web app)?</p>
<p dir="auto">Respectfully,</p>
<p dir="auto">Henry Seiden</p>
<ul>
<li>
<ul>
<li></li>
</ul>
</li>
</ul>
<p dir="auto">Techworks Pro Co.<br>
E: info<at>techworkspro<dot>com<br>
W: <a href="http://techworkspro.com" style="color: #777777;">http://techworkspro.com</a></p>
<p dir="auto">On 3 Mar 2026, at 8:45, Luís Trevisan wrote:</p>
<blockquote style="margin: 0 0 5px; padding-left: 5px; border-left: 2px solid #777777; border-left-color: #999999; color: #999999;">
<p dir="auto">Hi all,</p>
<p dir="auto">I'm experiencing duplicate messages in my Sent Items folder in Microsoft 365 / Exchange account.</p>
<p dir="auto">Setup details:</p>
<ul>
<li>Account type: Exchange / Outlook.com (Microsoft 365 corporate)</li>
<li>The duplicates appear exclusively in the Sent Items folder</li>
<li>The duplicate messages are identical</li>
<li>No other folders are affected</li>
</ul>
<p dir="auto">Has anyone experienced this with an Exchange account and found a reliable fix?</p>
<p dir="auto">Thank you in advance.<br>
Luís_______________________________________________<br>
mailmate mailing list<br>
Unsubscribe: <a href="https://lists.freron.com/listinfo/mailmate" style="color: #999999;">https://lists.freron.com/listinfo/mailmate</a></p>
</blockquote>
<hr style="border: 0; height: 1px; background: #333; background-image: linear-gradient(to right, #ccc, #333, #ccc);">
<p dir="auto">mailmate mailing list<br>
Unsubscribe: <a href="https://lists.freron.com/listinfo/mailmate" style="color: #777777;">https://lists.freron.com/listinfo/mailmate</a></p>
</blockquote>
</div>
</div>
</body>
</html>