We're at the point now where the challenge isn't how to communicate effectively with e-mail; it's ensuring that you spend your time on the e-mail that matters most.
Bill GatesThe difference between a stranger sending you a message that you might be interested in at a very low volume level, no repetition, just sending it to very few people, and that being done as spam - those things get close enough that you want to be careful never to filter out something that's legitimate.
Bill Gates