On 2026-03-03 at 11:29:33 UTC-0500 (Tue, 3 Mar 2026 16:29:33 +0000)
Henry Seiden <[email protected]>
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...
It is easily avoidable on the users’ end, regardless.
I'm sure a rule could do the trick.
It may be possible in MailMate to create a second mailbox for sent
messages, tell MM that it is the special "Sent Messages" mailbox
("mailbox type" contextual pull-down) and then just unsubscribe from the
place Exchange is putting copies. I HAVE NOT TESTED THAT!
On 3 Mar 2026, at 11:21, aisrael wrote:
I am not sure if it helps, but I found this message from 2022
(however it seems the raw headers of the pairs of mails were
different in the reported case, which may not be your case) :
This is a known issue: Mailmate moves the message from Drafts to Sent
after you send it (that's the one with few headers), and then
Exchange "helpfully" puts a copy of all outgoing mail into Sent as
well. I have simply made a smart "In/Out" mailbox to show me messages
where "From is not me" or "Received does not exist", which hides all
of the Exchange copies.
Alain
On 3 Mar 2026, at 16:48, Jeff Bullard via mailmate wrote:
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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