Must reading: Cultural Offering's memo to all email marketers. My favorite part:
I notice from your outlook meeting request you would like to "circle back" regarding a previous communication regarding our business challenges. I remind you that your previous communication was an unsolicited mass email and, although I do enjoy "streamlining processes" in order to gain "better access and control over our mission", I think it is a bit bold of you to place a meeting on my calendar especially since I didn't acknowledge your first email.
Be sure to read the entire post.