Easiest way to forward email using imap functions?

Hi all- I'm wondering what's the easiest way to forward a message using the imap functions. The emails I want to forward have attachments so I'm hoping there's an easy way to do this. Or do I have to break down the messages and then send via imap_mail_compose()? BTW the email address I want to forward the emails to is on a different server so I wouldn't be able to just do a imap_mail_copy(). Thanks for any input. David