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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