Copy sent mail in a mailbox folder

Hi list, I'm sending mails with PEAR::Mail / PEAR::Mail_Mime or with PHPMailer (http://phpmailer.sf.net). The final solution will implemented depending on which implementation better fits my needs. Anyway, and that is the problem, after sending the mail I want to save a copy of the mail in an IMAP folder called "Sent". I would be pleased if someone could send me a hint or a link how to achive this. Either with PEAR or with PHPMailer generated mails. My first thought was to walk through the mail object and extracting all necessary attributes and generating a new message and save this to the mailfolder... Thanks in advance reto