Well if I were to be the real English teacher that I am, I'd correct quite a few things...
Title: Do you put a comma after "Yesterday"? Example: Yesterday, the Lakers won.
I was looking for the answer to this question also, as my sentence would be "Yesterday, I received your letter." It seems a little weird to put a comma there, but then it seems kind of weird NOT to put it
We're glad to have you, but please note the date on threads before you reply. This person either got the answer hoped for or found mine sadly lacking (which you must have, since you bothered to reply) four years ago.
(By the way, I see no reason at all to capitalize "Yesterday" as you have done in your first line, and find nothing so wrong with e.g. t