Sending a thank you email after an interview is such a bad habit we have made during interviewing
After every interview people are expected to send a thank you email.
My company encourages this behaviour. Coz they think that employee has manners or some rubbish. I dont see the point.

As someone who has worked in HR. I understand your pain. I have seen so many thank you mails from candidates we know weren't going to get the job. Honestly after so many emails we stop noticing who's sent and who's not.