[MlMt] Duplicate messages in Sent Items (Exchange account)

[Robert Brenstein]

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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