I once sent out an invitation to a bunch of people to join me in an event I was creating using my message sender. It was my Etheria event. I loved that event it was fun. But one person I sent to sent me a message basically saying..."NEVER SEND ME SPAM AGAIN, AND IF YOU DO, I'LL KILL YOU AND ALL YOUR SL CHILDREN..HOW DARE YOU OMG, I HATE YOU."
The only time I ever got testy with someone about a subscriber is when I accidentally hit the one at Frank's Jazz. They'd removed the unsub button and it took me weeks to get off their list. Meanwhlie, they actually did send a note card per day