Email doesn't work

I make project with html-emailing, and actually it was working until I changed PC. I’m not sure that it caused by changing PC, because I did a lot modifications on my new ps before I find emails don’t work.
The problem is that there are no errors while sending email and I don’t receive any email. So it doesn’t work and there are no errors in console.
Is there any solution how to find what’s the problem and why it doesn’t send emails?