I thought about checking author name, but it didn't really seem worthwhile bothering with it since there's no impact in sending AM a message; it doesn't hurt anything. You can specify -nomessage on the command line (or -nomess for short) to suppress author messaging if you wish though.

Update 6/7/2005:
The appearance of a small bug in the automated /msg code gave me a good reason to work on that portion of the code. Consequently, I've now fixed the issue discussed here, and /msg's will not be sent to Anonymous Monk.