Remove Duplicate Messages

Z 1 z 5 hwěžkow pohódnoćeny

wot drenzyme dnja Jan. 16, 2018 · trajny wotkaz

I have a POP account with a lot of email in it. Something got fouled up and most of the email was either duplicated or triplicated. This add-on will not remove the 20,000 unwanted duplicates. It dies as soon as I click on "Delete Selected" button.