Alternatively, look into setting up your mail spools to have a common group and have 660 permissions. If that turns up no solution, you may want to subscribe to the list yourself and post your question there. It may be answered by another NeoMail user, or by myself. Any answer provided will be available for others to read should they encounter the same problem at a later date and search the archives. As stated in the script itself, there is no warranty, none at all, included with NeoMail.
Constructive criticism is quite welcome.