Email Or Mail Thank You Note After Interviewing Okay To Send An Email Thank You Letter After Second Interview?

Okay to send an email thank you letter after second interview? - email or mail thank you note after interviewing

Hello,

I recently had a telephone conversation with a hiring manager. After the phone conversation, I sent an email to thank him. A few days later I was asked to come in a second interview with him and the team. Now I send a mail to the auditor or the manager, and I can send a note via e-mail? Also in attendance were two of the survey of the various states and could get his name. "The e-mail handlers using his full name?