If you don't want to use

Posted by willow on Monday, 16. April 2012 at 09:18 Bali Time:

In Reply to: Dos and Don'ts posted by Kgb on Sunday, 15. April 2012 at 11:30 Bali Time:

EOM (end of message) you can use: NM (no message), NT (no text), NIM (no internal message), SIM (subject is message) or NMP (not my problem) :)