accidental.
I had an angry email telling me to stop sending spam to the chap in question. I pointed out that an email can be set to appear as if it's from any address, and that I didn't send it. He got very angry and kept emailing me til I said "So do you want to buy some viagra or not?", he said he didn't so I told him to stop wasting my time.
( CowJam, Thu 21 May 2009, 17:54, archived)