Thunderbird ignores some mails and does not download them
I discovered a week old email when querying my email account in a browser that was automatically marked as spam, but is not spam. Marked it as "no spam" and as "unread" and moved it back to the inbox. Then launched Thunderbird and after launching it I again force thunderbird to retrieve mails from all my accounts, but this mail was ignored by Thunderbird. Waiting for several hours and trying again doesn't help either.
What' wrong?
Thunderbird v102.9.0 - Email.Provider: gmx - Method: POP (and changing to IMAP is no solution for me)
tia, Tom
Modificado por Tom R. a