Do you men like to receive letters or thank you notes?

I'm about to give a Christmas gift to a former colleague of mine and there's some things that I wanted to say to him and I think I communicate better in writing then face to face, but sometimes I talk to much and writing things I do the same.

I just don't want him to get bored and in the end everything I did stays unappreciated.
Do you men like to receive letters or thank you notes?
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