Ugh, finally got all the crap mail downloaded, marked, and removed to the trash. The final tally is over 20,000! All returned mail from some bastard spammer who spoofed my address. You would think sysadmins would know how to check the real sender address by now. But no, lazy, slovenly mail is the rule of the internet.
What a time wasting nightmare that's been. And probably more to come.