Some combination of screwy net access and a LiquidWeb mail server upgrade resulted in my Inbox duplicating all of the enclosed messages. Since I’m nowhere near inbox zero the glitch resulted in a few thousand messages to wade through. I figured I wasn’t the first to deal with this, and quickly found two scripts which id’d duplicate messages: Tim Auton’s Select Duplicates and Andreas Amann’s Mail Scripts. I ended up going with Time Auton’s script because of his description and a quick review of his code. The script finished quickly enough (running from Script Editor) and left me with all the duplicated messages selected and ready to review and delete.
The LiquidWeb mail upgrade caused another problem, my IMAP folders were now grouped inside my Inbox. The solution was to add the IMAP prefix “INBOX” to the account settings, as shown here:
And yes, I do really have that many active email accounts. Pity me.