Just put it into try and suddenly found that mail in Cyrillic is completely unreadable because of wrong code page in headers. So I changed in “sacf.php” this line:
$headers .= "Content-type: text/html; charset=iso-8859-1" . "\r\n";
$headers .= "Content-type: text/html; charset=UTF-8" . "\r\n";
and now everything OK.
Tried to contact author, but his site is closed and domain for sale… Well…