You can't mention the website.  If you do, you'll ruin it for the few thousand people that are playing along and sending my Mom stuff.

You can't mention me.  Since the project started, she originally put the blame on me, but now it's shifted to my brother (see rule number 4).  She's not sure how she is getting postcards and other stuff from around the country

No perverted stuff.  C'mon, it's my mom.  Let's have fun with it, and not turn it into something stupid that forces me to take the site down.

Bonus points for you if you send something Air Force related, or in an Air Force envelope.  My brother is in the Air Force, and Mom thinks my brother is having his buddies send crap from around the country/world.  I'd rather he get the blame than me.

Make the message fun, but not perverted.  Give Mom the 'wish you were here' line.  Tell her you were friends back in the day.  Or don't write anything, just sign it.  Be creative, think of something funny or interesting to put in your message.