Job Interview Questions: Who to send Thank you letter after Job interview?

My HR got my husband a job interview at a different client HR works for. He was interviewed by two direcotirs in different departments. My husband does not have neither one of their e-mail addresses because he was obviously contacted by the HR. Who do you think he should send the thank you e-mails to? I thought maybe calling the office to ask for those two guys e-mail addresses for Thank you letters is too much? Should he just send it to HR guy?

What do you think?
Any input would greatly be appreciated.

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I like the idea of calling and getting the email addresses. It doesn't hurt to thank the HR person as well. And I think a thank you email is better than sending a letter.

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• Honestly in what the person said below in about an e-mail instead of a thank you letter. I've learned through taking many business classes that after an interview if you send an e-mail it shows that you did it at a fast pace without taking your time that it seems unprofessional. If you send a lettter it requires more effort and time because anyone can pop an e-mail.
  
  Second I would thank the person that interviewed you as well as the HR company that was doing the hiring/interviewing. I hope that helps :) I wish your husband the best of luck :)