"Thank You" letters

This morning I backed into a discussion about thank you or followup letters.

The crew agreed they are good, and then devolved into email or snail mail?

Who cares?

I think we were missing the real point.

I think the purpose of a followup letter is to give the recipient something they want or care about. I usually find that within a day of a meeting I see some information about a subject they mentioned, so I send it on.

I am sending something useful to them, instead of, "That was good for me, wanna buy now?"

What are you sending?