How'd that happen?

Let me first say that I have a few e-mail accounts, as do many people. One of them was my register-for-everything/order-stuff-through/expect-to-get-spam account. The other one was clean. E-mail from my family and friends only. No spam, no junk mail, nothing. It was a perfect little world. A few weeks back I sent out an e-mails (late in the evening) to most of my contact list to announce my new website. Within hours, spam started arriving in my "clean" account. I don't know a heck of a lot about servers and e-mail and stuff, but did someone's server disperse my address?? I say this because I got spam back before most of my contacts would have even opened their mail yet!! I am pretty sure that someone I sent the mail didn't start me on a spam list, but rather someone's e-mail system did. This really irritates the crap out of me. So much for my clean pristine account. Oh, and most of the spam has attachments (which no I am not opening!) so that makes me feel so good too!

errr............................