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Why doesn't Tbird block an address I repeatedly mark as "Junk"?
The messages even contain the note "Thunderbird thinks this message is Junk" and I "Mark" it as junk, but I I still keep getting junk messages from the same email address. Why doesn't Tbird send messages from this email address to Junk?
Alla svar (1)
The from address is not a consideration in the classification of an email as junk. Perhaps that is why.
See https://support.mozilla.org/en-US/kb/thunderbird-and-junk-spam-messages
Then have a look at this one for how you actually block a sender. https://support.mozilla.org/en-US/kb/blocking-sender