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

[Jeff Bullard]

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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