arfemailheader
Usage:
add_filter('arfemailheader', 'your_function', 10, 2);
function your_function($header, $header_array){
//append header information.
$header[] = 'ADD HEADER INFORMATION FOR SENDING MAIL.';
return $header;
}
Parameters:
$header
Array of header information.
$header_array
Array of particular values like To email address, Subject.