SevenCubed - 4:50 pm on Jan 6, 2011 (gmt 0)

it does make me wonder where they got an unpublished e-mail address

It's often times harvested from mail client files of someone's compromised computer that had you as a contact. Or, as an unsuspecting good-intentioned friend recently did for me, send me an eCard from a third-party source, then the spam started rolling.