I recently went to a job interview, and would like to send a thank you letter to the interviewers. There were two interviewers; one manager and one person from HR that was called in on the spot to fill in for another person that was supposed to interview me originally. Here's my pinch: The manager was the person conducting most of the actual interview - and it was pretty obvious that he is the one that makes the decisions - but I don't have his email address. I do, however, have the email address of the HR person who filled in. I was told I would get notified on how it went very soon, and so I doubt I'll have enough time to send letters in the mail.
Should I ask the HR person for the managers email, and then send them both a thank you letter afterwards? If so, how would I phrase it?
Should I write the thank you letter, send it to the HR person, and ask him to forward it to the manager?
Or perhaps there is another procedure that's more appropriate?
-----------------------------------EDIT---------------------------------------
I guess I was a bit unclear. I'd like to send an email to the parties. I just wanted to point out that I won't have time to send them actual physical mail, as it won't arrive on time.