I do use Thunderbird. My mailbox is a POP3 account. I download mail and move it to folders with per sender filters. That said, 9,999 other people are about to

I do use Thunderbird. My mailbox is a POP3 account. I download mail and move it to folders with per sender filters. That said, 9,999 other people are about to reply that they use GMail or something like that. Maybe 99,999.