<?php
$headers .= 'Cc: noreply@maicol07.tk\r\n'; //<-- his code
$headers .= 'Cc: noreply@maicol07.tk' . "\r\n"; //<-- correct way???
?>
Are you sure the last added header can't contain a line break string?? Please take a look at example #3 : https://www.w3schools.com/php/func_mail_mail.asp .