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Windows 10 reached EOS (end of support) on October 14, 2025. For more information, see this article.

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Message with a large attachment will not copy to SENT folder...what can I do to correct?

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After sending a message with a large attachment, I receive an error message that the message did not copy over into the SENT file. It allows me to retry, which does not correct the problem. Ultimately, I have to 'X" out of the message without knowing for sure if the message was sent.

After sending a message with a large attachment, I receive an error message that the message did not copy over into the SENT file. It allows me to retry, which does not correct the problem. Ultimately, I have to 'X" out of the message without knowing for sure if the message was sent.

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I had and solved a similar problem. Maybe not your exact problem though. In my case I had two e-mail accounts, and I experienced this sort of problem both in Tbird and Fossamail, a Tbird derivative. I solved my problem by having only one e-mail account in Tbird and the other one in Fossamail.

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My problem is not that I can not send the file, I can and it is delivered to the recipient normally. The problem that I am having is that I do not have a record of the messages that I have sent if they have an attachment because TB does not send a copy to my SENT folder.

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right click the folder and select compact.

Now right click the folder again and select properties. What is the size on disk?

Did compacting allow a message to be saved?

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Matt, Thanks for your answer but it did not help. BTW, it says the disk size is 1.5 GB

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Can you move a lot of that to amother folder, or archive it? or delete some of it? and compact again.

Is it an IMAP or POP account?

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Matt, I relocated about 1/3rd of my messages to another folder and then compacted again...I still have the same problem. George

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Well that really leaves one thing.

Create an exception in your Anti virus program to exclude the Thunderbird profile folder from on access scanning.

Locate your profile folder by going to the Thunderbird help menu and opening the troubleshooting entry and clicking on the show folder button. Windows explorer will open in your profile folder.

There have been issues with slowness and scripts timing out recently caused by scanning, I am sort of hopeful this is another manifestation.

Basically it takes an Anti virus program some minutes to scan a 1Gb file and I think what is happening is Thunderbird tried to update the file, the AV starts scanning because the file has been opened and after that Thunderbird just gives up.

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Matt, I think you are on to something, and I followed your instructions and got to the Windows Explorer page, but there were no more instructions once I got there. Can you provide instructions from the Windows Explorer page on? Thanks, George

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You will need to consult the help for you anti virus program for how to do that, as they are all different. All I can advise to the path to exclude which is the one windows explorer is showing.

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Gekozen oplossing

I had and solved a similar problem. Maybe not your exact problem though. In my case I had two e-mail accounts, and I experienced this sort of problem both in Tbird and Fossamail, a Tbird derivative. I solved my problem by having only one e-mail account in Tbird and the other one in Fossamail.