I have a suggestion/request--It seems to be nearly impossible to get rid of ancient email addresses. And there is probably good reason to have Thunderbird keep harvesting them and hanging on to them, but dead addresses? No. Would it be possible to add a filter to the existing system where-by whenever autofill tries to offer addresses that are no longer wanted they could be flagged at that time as dead and never offered again? And something similar where a user could go through their email addresses to flag any no longer wanted so they could be excluded from autofill?
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You need kill bad address in Address book (Tools - Address book, or Ctrl+Shift+B)