Thank You Email After Interview Cosmetics Should I Email An Employer After A Phone Interview To Thank Them?

Should I email an employer after a phone interview to thank them? - thank you email after interview cosmetics

Today I had a telephone conversation, and my friend told me that I should email the interviewer to thank him. This is true for an unpaid internship and with the investigator before (although I do not mind) recall

Not sure if this is as "spam" e-mail because they thanked him by telephone. Any advice would be great, thank you!