Comment 46 for bug 1853007

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In , Tylla-at-bugzilla-mozilla-org (tylla-at-bugzilla-mozilla-org) wrote :

As an addenda (and because the current downloadable version is still 78.*) I have to mention THE real problem with this bug.
If Thunderbird is used long enough to accumulate 10000 temporary files in the TEMP directory, so it has all the files from nsemail.eml to nsemail-9999.eml, Thunderbird will suddenly stop sending e-mails with an error.
It can be solved by simply deleting the files.

The system was a Windows 7 SP1 64bit with now latest TB 78.8.0.
But we met this problem earlier on a few machines (Win 7 and 10 mixed) with older and latest TB versions, where unknowing the real cause we solved the problem by removing TB, cleaning every corner of the system and meanwhile cleaning the temp folders as well.