One more. I wasn't done.

functions/compose.php

@@ -93,6 +93,7 @@ function sq_get_attach_tempfile()
 function sq_send_mail($to, $subject, $body, $from, $cc='', $bcc='', $message='')
 {
 
+   require_once(SM_PATH . 'functions/mime.php');
    require_once(SM_PATH . 'class/mime/Message.class.php');
    require_once(SM_PATH . 'class/mime/Rfc822Header.class.php');
    require_once(SM_PATH . 'class/mime/ContentType.class.php');