Follow up thank you email after interview

I had a Noc interview yesturday and I think it went really well, there was only 1 question I wasn't really able to answer, san vs nas mainly b/c i don't work in a noc environment yet. after the email i met w/ HR to discuss benefts ect, he said he had 1 more phone and 1 more in person interview i think today
Anyways, I wanted to send a personal email to my interviewer. He did not give out his email, but based on the recruiters email I can probably guess what it is. My question is this, should i try and send it directly to him (at the end explain how and why) or should i just send it to the recruiter and ask to forward it to the supervisor who i interviewed with?
Thanks
Anyways, I wanted to send a personal email to my interviewer. He did not give out his email, but based on the recruiters email I can probably guess what it is. My question is this, should i try and send it directly to him (at the end explain how and why) or should i just send it to the recruiter and ask to forward it to the supervisor who i interviewed with?
Thanks
Comments
B.S. - Computer & Network Security
"I especially enjoyed hearing about your company's plans to migrate from technology X to technology Y."
anything I should expect? i wasn't expecting a second interview as i don't recall him mentioning it in the primary interview
Good luck!
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