Okay, I've fixed that directory path bug.
I forgot to update it to make it workable for some forums. It now uses the $bburl variable - make sure your forum path is set correctly in your Admin CP vB Options section.
For those with problems, download the new email.php (making sure you refresh the cache). Also, this uses cookies, so make sure you close all windows, upload the new email.php and open a new window to login again.
EDIT: Make sure you empty your browser cache when attempting to download again - otherwise, the email.php is in your temporary folder and will be the OLD one.