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) :
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.
Alain
On 3 Mar 2026, at 16:48, Jeff Bullard via mailmate wrote:
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.
Jeffrey W Bullard PhD | FACerS | FWAS
Department of Materials Science and Engineering
Zachry Department of Civil and Environmental Engineering
Texas A&M University
3136 TAMU
College Station, Texas 77843
On 3 Mar 2026, at 9:37, Robert Brenstein wrote:
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.
On 3 Mar 2026, at 14:45, Luís Trevisan wrote:
Hi all,
I'm experiencing duplicate messages in my Sent Items folder in
Microsoft 365 / Exchange account.
Setup details:
- Account type: Exchange / Outlook.com (Microsoft 365 corporate)
- The duplicates appear exclusively in the Sent Items folder
- The duplicate messages are identical
- No other folders are affected
Has anyone experienced this with an Exchange account and found a
reliable fix?
Thank you in advance.
Luís
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