Is it possible to block some users from sending attachments, and to allow other users to send acceptable attachements?
For example, any user who's name that starts with "untrusted", is not allowed to send any attachments. So, "untrusted001" and "untrusted002" could not send attachments. Also, users who's name starts with "super" are allowed to send PDF and XML files. For example, "super001" and "super002" could send attachment "totals.pdf" or "totals.xml", but not "totals.doc". I think this is possible using Restriction Classes, but a friend thinks Postifx attachment rules apply to all users, and I need to use a add-on content filter. How could I do this? (generally speaking) I'm pretty sure Postifx can do it, by itself.
