I'm Gonna Sit Right Down and Write Myself a Letter

I'm gonna sit right down and write myself a letter...and make believe it came from you

I'm gonna smile and say
I hope you're feeling better

I'll close with love the way you do

From Wikipedia
"I'm Gonna Sit Right Down and Write Myself a Letter"
is a 1935 popular song with music by Fred E. Ahlert and lyrics by Joe Youn