Thanks!

This did cross my mind, but I think (I'm not 100% sure) that bulletproof is a highly specialize word. You'd only make this connection if you we're interested in bulletproof hosting. You're the first one to mention it so I think you might just be oversensitive :) It would be interesting to see if lots of other people make this connection.

I must have written 30 different tag lines for the homepage, so I might try split-testing them at some point.

P.S. The homepage tag-line was almost... "Rich HTML email development that isn't like punching yourself in the face."