Contact Form not sending email

Do you get any response message after you submit the form?

I get a green line “thank you” message. The email is not sent. I tested just now, and again problem persists. First bug in 4 years.

Update: I checked my SPAM too. Nothing there.

See FAQ > I see a response message “Thank you for your message. It has been sent.” with green border, but I never receive a mail for that.