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

[Eric Sharakan]

On 3 Mar 2026, at 12:36, Bill Cole wrote:

> On 2026-03-03 at 11:29:33 UTC-0500 (Tue, 3 Mar 2026 16:29:33 +0000)
> Henry Seiden <mailmate at lists.freron.com>
> is rumored to have said:
>
>> If it has been the case this long, pretty sure Benny, the developer 
>> has known about it as has M$ (Microsoft).
>
> Benny knows A LOT. Unfortunately, not enough people pay for MM to 
> support him hiring help, or at least that is the impression I've 
> gotten.
>
> Microsoft knows NOTHING about 3rd-party mail clients. They don't care, 
> except when given an opportunity to degrade the experience of using 
> non-MS software.
>
>> As to why they each made that conscious decision is up to the 
>> respective developers, I’m betting it was a conscious one on each 
>> of them. Mailmate shouldn’t be responsible for unique non-standard 
>> server’s, that’s a slippery slope in my opinion.
>
> Agreed. It's an easy workaround for those cursed with Exchange to 
> either ignore the dupes or use a MM rule to hide them.
>
> I *thought* that Benny had provided a new 'defaults' pref to disable 
> saving a copy of sent messages to the Sent mailbox, but I can find no 
> such conversation now...

Benny did provide a workaround of sorts; look here: 
https://freron.lighthouseapp.com/projects/58672/tickets/2145-do-not-store-copies-in-sent-messages#ticket-2145-32

I've been using this workaround for years.  In addition to setting some 
other mailbox as the Sent Messages folder, I went in to the account 
settings and unsubscribed from Exchange's Sent Items folder.

-Eric
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