usefulness of --ham-ing my SENT mail?

[Ryan Nelson]

Discussing spamassassin with some people over dinner, we wondered 
whether a good source of hammy data might be messages I create myself 
and send out.  Presumably, I talk about the same subjects and use 
similar words as the people I email with most frequently, and I'd get 
the added benefit that any reply with my message (or parts of it) in 
the body would already have been learned as ham.  (and only people i've 
emailed would have that data, not spammers)

I'd obviously want to not learn as ham any flamewars, or complaints, 
but what do you all think about --ham for all sent mail?  It certainly 
shouldn't be too hard to stick into my current mail delivery system.

Similarly, something in my delivery system that auto-whitelists anyone 
i've sent to makes sense, assuming I'd like a reply.  Is anyone out 
there doing this now?  By what method?