For as long as I can remember I have received handwritten thank you notes, and have appreciated every one regardless of whether they were personal or professional. And in all honesty, I'm someone that still loves getting something via "snail mail". Unfortunately, I think this is an art that has been long lost over time due to the increased use of technology. We have fallen into the habit of either sending an email to say thank you, or not sending anything at all (which if it is between these two I would say make sure you at least send an email) and have stopped sending personalized, handwritten notes. This is something so simple that shows you took the time to write out your thoughts, you personalized it, and you are grateful for them giving you their time. And sure, it can be argued that you can do all of this via email, and you can, but think about how much of a differentiator it would be for a hiring manager or business owner to see this vs. the other candidate they interviewed that either didn't send a thank you or sent one through email. It's a standout effort and always very much appreciated. Here are a few articles I found that you might find interesting as well: https://www.nytimes.com/2014/04/06/fashion/the-found-art-of-thank-you-notes.html?_r=0 http://www.youtern.com/thesavvyintern/index.php/2016/03/27/interview-art-writing-thank-you-note/ http://ideas.hallmark.com/articles/thank-you-ideas/thank-you-messages-what-to-write-in-a-thank-you-card/

So, while I know it takes much more time, just think think it over. You never know, it could be the trick that lands you the job you're really crossing your fingers for! Good luck in your interviews!