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Thunderbird still sometimes does not copy a sent email to the sent folder

  • 3 svar
  • 1 har dette problem
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  • Seneste svar af Matt

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System: Windows 10 Pro PC

Sometimes when I send an email using my Provider t-online.de I occasionally get "the email was sent but not copied in the sent folder". When I restart Thunderbird this seems to stop for a while. I wonder if I have more than one instance of Thunderbird active so perhaps there could be a conflict. If so how do I stop multiple instances?

Settings: Provider t-online.de ( this a very popular email service) IMAP IMAP secureimap.t-online.de SSL SMTP securesmtp.t-online.de STARTTLS

Any help on this.

Another Comment -- not to sure if I like the new Thunderbird format....but one is new to this new format so perhaps after a while it may be ok.

Alle svar (3)

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Which antivirus program are you running and have you added Thunderbird's profile folder to its exclusions list?


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It is on my Kaspersky list, but the symptoms do not appear to be Security problems. As I wrote sometimes it works and sometimes I need to restart Thunderbird then it works for a while. No change if I use VPN.


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Try logging the IMAP connection as the copy occurs using IMAP.


The log files will be huge, so restart Thunderbird reasonably frequently and delete the logs unless then have anything useful in them like a failure. It is a fairly common issue (common enough that there is an affer to save to local folder programmed in.) and it has occurred to me. Only perhaps twice ever and always on my GMX account. I would guess there is a problem with the way Thunderbird does things, or a bad interaction with the way Thunderbird does it Vs the server implementation of IMAP. Like all standard, no one has a perfect implementation. But without exact details of what occurs it is not possible for a developer to replicate and therefore fix the problem. It may also be a timing issue that is almost impossible to fix.


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