Candidates interested in reaching lots of people cheaply via email tend to want to be pretty aggressive in terms of who they send to, but that aggression can backfire (getting you on spam blacklists that in turn prevent you from getting your message through to those who do want to receive it).
Check out this posting at Mandate Media’s Politics and Technology blog.
Happily, one of the eggregious examples they point to is the Charlie Crist campaign’s practice of adding people to its lists at random and ignoring requests to be removed from the list. But don’t doubt for a minute that Democrats have been guilty of the same overreaching. To be honest, these clips are making me rethink some aspects of how email has been handled in campaigns I’ve been involved in as well.