I think im doing things correct:
- Im specifying charset of PHPMailer object: 
$mail->CharSet = "UTF-8"; - Charsets of mail body and php script are UTF-8 too
 
But email arrives with this kind of errors (words are broken by black quarter with "?" symbol:
- опреÐ �елени
 - оÑ �ибка определения
 - click to see the screenshot of example email
 
Update 1
Found something kinda chinese glyphs (but not cyrillyc symbols) in the email's source