If it has been the case this long, pretty sure Benny, the developer has known about it as has M$ (Microsoft). 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.
It is easily avoidable on the users’ end, regardless. Respectfully, Henry Seiden - - Techworks Pro Co. E: info<at>techworkspro<dot>com W: http://techworkspro.com 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 >> >>> _______________________________________________ >>> mailmate mailing list >>> Unsubscribe: >>> https://urldefense.com/v3/__https://lists.freron.com/listinfo/mailmate__;!!KwNVnqRv!GH26zL_0CuSnuOaOC2n0QgkFpftFLv4rOohR0hN1kGJJQAHNakfBeUikt_AdGHsAjmd5e_kawemLqNopSR2ZVOgpBTK-cQ$ > >> _______________________________________________ >> mailmate mailing list >> Unsubscribe: >> https://urldefense.com/v3/__https://lists.freron.com/listinfo/mailmate__;!!JFdNOqOXpB6UZW0!tPNW4r5_F51XpSj-obZ9EWh9WS8nasOGAGM61PI0e8xWzGyPnVCnW1X-nByD7I8WJ0XvFeMVyj1AdM0petgzxA$ > _______________________________________________ > mailmate mailing list > Unsubscribe: https://lists.freron.com/listinfo/mailmate
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