So basically if ever I really want a job I make a habit of sending a thank you letter after the interview to the people in question.

This time I am being interviewed for a vacant manager job in my company(my former manager) and his manager(sr manager) interviewed me. I want to do the same thank you for your time message but it seems weird because he's technically my manager until the position is filled. Is it pointless? Redundant? Is there a nice way to do it?

I have to send it to 2 people. I am thinking of just sending them a brief message either together or individually thanking them for considering me but not sure if it makes sense since I work with them everyday.