Some fool took an email account coming from a domain I own and sent millions of emails about anti-obesity drugs with it in the from line.

I'm now getting about 50 undelivered message, return to sender etc emails every three minutes. Luckily I've managed to set up a decoy email account for all of them so they won't bother me anymore (I hope) but for the past 24 hours it's been infuriating.

Has this happened to anyone else? Has it happened to your main email address? Luckily for me this was just a non-existent address on my domain that forwarded to me. I don't have a clue what I would do otherwise.