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<body><div style="font-family: sans-serif;"><div class="plaintext" style="white-space: normal;"><p dir="auto">FWIW, I archive my mail off-server. There, I have found instances where Sent Mail is duplicated from this list to my Inbox, thereby duplicating what was sent by me here. It does clutter up the Archive.</p>
<p dir="auto">This seems done by default on the list server, sending back to those who choose that acknowledgement in the server settings. I believe it can be otherwise configured.</p>
<p dir="auto">It has not yet been a concern because I can easily delete those duplicate in my Archive app (EagleFiler) as well as other instances where it may occur (such as Outlook). Now it seems I can do the same with a Smart Mailbox. Hmm…</p>
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On 3 Mar 2026, at 11:21, aisrael wrote:</p>
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<p dir="auto">I am not sure if it helps, but I found this message from 2022 (however it seems the raw headers of the pairs of mails were different in the reported case, which may not be your case) :</p>
<p dir="auto">This is a known issue: Mailmate moves the message from Drafts to Sent after you send it (that's the one with few headers), and then Exchange "helpfully" puts a copy of all outgoing mail into Sent as well. I have simply made a smart "In/Out" mailbox to show me messages where "From is not me" or "Received does not exist", which hides all of the Exchange copies.</p>
<p dir="auto">Alain</p>
<p dir="auto">On 3 Mar 2026, at 16:48, Jeff Bullard via mailmate wrote:</p>
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<p dir="auto">I appreciate the response and that this is a cosmetic issue and not an operational problem. Even so, I think the developer should be able and willing to investigate and fix this, especially since the duplicates do not appear within any other email client I have on my computer (Apple Mail, Outlook, and Airmail). It those apps all figured it out, why not MailMate? Just saying it “is a known issue and can be ignored” is not a very helpful response for those of us who are experiencing it, especially since (a) Exchange is an extremely common mail server and (b) some of us did pay at least a small amount for MailMate.</p>
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<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>
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On 3 Mar 2026, at 9:37, Robert Brenstein wrote:</p>
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<div style="display:none !important;display:none;visibility:hidden;mso-hide:all;font-size:1px;color:#ffffff;line-height:1px;max-height:0px;opacity:0;overflow:hidden;">This is a known issue and it has been discussed on this list a number of times. As far as I remember, the duplication is caused by Exchange server due to the way it handles sending mail. You can just ignore this duplication. Mail was sent only</div>
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<p dir="auto">This is a known issue and it has been discussed on this list a number of times. As far as I remember, the duplication is caused by Exchange server due to the way it handles sending mail. You can just ignore this duplication. Mail was sent only once. If you search past posts in the list, you may find how others go about this.</p>
<p dir="auto">On 3 Mar 2026, at 14:45, Luís Trevisan wrote:</p>
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<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:<br>
- Account type: Exchange / Outlook.com (Microsoft 365 corporate)<br>
- The duplicates appear exclusively in the Sent Items folder<br>
- The duplicate messages are identical<br>
- No other folders are affected</p>
<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</p>
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