Can't delete mail from POP server in Thunderbird, despite leave messages on server until I delete them.
Email is on a POP server from our ISP. I have checked "Leave messages on server" and "Until I delete them." Using Tbird 60.9.0 on a MacBook Pro. Am able to delete messages by going to webmail, but that is painful with almost 50,000 emails on the server (don't ask, it's my wife's account), since webmail only lets you see 100 emails at a time and only in chronological order.
Additional System Details
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