I wrote to Piers Anthony (author) via e-mail and got a very nice note written on letterhead and a signed bookplate in the mail a few days later.

Not as many authentic ones these days, mostly preprinted items.

The best I've found for real signatures seems to be college football and basketball coaches.

Lots of celebritys.

If you type in Email Success into the search box then you will find who replys.

If you just want a PP then email to studio fan mail.

There is a thread that has all the celebs who are SFM clients

the majority of emails are very easy to find.

goodluck

Who are some famous people who will send you an autograph in the mail if you request it through email?