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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