Código PHP:
$headers = " From: [email protected]\r\n";
$headers .= "MIME-Version: 1.0\r\n";
$headers .= "Content-type: text/plain; charset=iso-8859-1\r\n";
mail('[email protected]',
"$sitetitle Member Account",
"Hola ñ áéíñó",
$headers);
Funciona perfecto para mi :S