Extension of PHPMailer to include S/MIME Signing When Sending E-mail

I need to send signed e-mails using S/MIME. Right now, i use the the PHPMailer tool to send E-Mails. I would like to augment PHPMailer to support signing e-mail with S/MIME. S/MIME support can be potentially built into PHPMailer. The openssl module for PHP has the necessary functions for signing. It's just a matter of setting up the relevant MIME headers. The completed solution needs to be able to use S/MIME to sign any e-mail that PHPMailer can generate, including, but not limited to, text and text+attachment. ## Deliverables 1) Complete and fully-functional working program(s) in executable form as well as complete source code of all work done. 2) Deliverables must be in ready-to-run condition, as follows (depending on the nature of the deliverables): a) For web sites or other server-side deliverables intended to only ever exist in one place in the Buyer's environment--Deliverables must be installed by the Seller in ready-to-run condition in the Buyer's environment. b) For all others including desktop software or software the buyer intends to distribute: A software installation package that will install the software in ready-to-run condition on the platform(s) specified in this bid request. 3) All deliverables will be considered "work made for hire" under U.S. Copyright law. Buyer will receive exclusive and complete copyrights to all work purchased. (No GPL, GNU, 3rd party components, etc. unless all copyright ramifications are explained AND AGREED TO by the buyer on the site per the coder's Seller Legal Agreement). ## Platform CentOS 5.0, Xampp 1.6.3b