What username you mention? Is it the name that appears as the sender? Then if yes, try this one:
<?php
if(isset($_POST['contact']))
{
$name = strip_tags($_POST['name'], '');
$email = strip_tags($_POST['email'], '');
$subject = strip_tags($_POST['subject'], '');
$message = strip_tags($_POST['message'], '');
$myemail = "My Name <email@myemail.com>" . ", " ;
$myemail .= "My Name <secondmail@email.com>" . ", " ;
$myemail .= "My Name <thirdmail@email.fm>";
/* To send HTML mail, you can set the Content-type header. */
$headers = "MIME-Version: 1.0\r\n";
$headers .= "Content-type: text/html; charset=iso-8859-1\r\n";
/* additional headers */
$headers .= "From:" . $name. "" . "<" . $email .">\r\n";
$headers .= "Cc: [email]ccemail@email.fm[/email]\r\n";
mail($myemail, $subject, $message, $headers);
exit;
}
?>
Look closely at the From headers.