PHPMailer SMTP

Spam Assassin is filtering my websites email. Site is written in PHP and is using system mail call. Reconfigure PHPMailer class to use SMTP instead of mail(). Place SMTP configuration properties on a PHP based admin panel so they are easily configurable. There are at least 20 scripts which use the PHPMailer class with several calls within each script. I have further enhancements needed for this site in the future. We also need to address message formatting that is causing spam assassin to rank the emails high as spam. There are some formatting issues given by the spam assassin engine. BAYES_99 DEAR_SOMETHING HTML_IMAGE_ONLY HTML_MESSAGE HTML_MIME_NO_HTML MIME_HTML_ONLY T_HEADER_FROM_DIFFERENT_DOMAINS FH_FROMEMAIL_NOTLD FREEMAIL_FORGED_REPLYTO FREEMAIL_REPLYTO_END_DIGIT T_HEADER_FROM_DIFFERENT_DOMAINS T_REMOTE_IMAGE URIBL_BLOCKED