I used to get lots of spam but have since implemented "Choicemail" to block all my spam. It was about 99.9% effective.
Starting a couple weeks ago, I get about 10 spam emails a day that appear to come from another user in my orginization (firstname.lastname@example.org). Is there a way to set up filtering so that any email that comes from an address within my organization but does not come from within my own exchange server is blocked? I do use Outlook Web Access, but, the way I understand it, the actuall email is still sent from my exchange server. OWA is just a way of accessing it remotely.