Setting up DomainKeys/DKIM in a PHP-based SMTP client [closed]

Answer 1

A class solely for DKIM which is a spin-off from PHPMailer, but with improvements regarding the respect of the RFC and nice-and-clean code :

https://sourceforge.net/projects/dkim-class-php/

Example :

include_once('dkim.class.php');
$dkim = new DKIM();
$dkim_header = $dkim -> get_DKIM_header($to, $subject, $message, $headers);
mail($to, $subject, $message, $dkim_header.$headers);