I run an e-mail list for families who use the same curriculum I do, and there are over 400 members (only about 100 are really active, with another hundred posting once a month or less). We tend to abbreviate some of the materials we discuss, like DbD (Day by Day, the lesson planner), P2P (Penmanship to Praise), etc.
Combine that with the things I posted above and you've got a message that looks like it's typed in code!
Kelly H.