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I received his autograph today, and I wasn't sure if it's real or a PP.
I sent it to:

Mark Harmon
"NCIS"
Valencia Studios
26030 Avenue Hall
Box 4
Valencia, CA 91355
USA

This is his via venue address, where they film, but I've seen several authentic successes from his agency. Are the via venue requests PP and the agency requests authentic?
Any help on authenticity? Thanks, I appreciate it!

picture: http://oi55.tinypic.com/21f05ra.jpg

Only you can tell if it's a PP. Hold it up to the light and see if the signature is part of the picture or if it is on top of the picture. It's definitely authentic, I don't know about their TTM successes.