I am currently running a windows 2000 server with Exchange 2000 SP3. My machine continues to relay messages at night and I am having problems stopping it. I have applied all the current exchange patches and have unchecked the, Allow all computers which sucessfully authenticate to relay, regardless of the list above, box and only selected the list below with my domain. I have disabled anonymous SMTP Connections and filtered unsoilcited email messages KB313395. What elso should I try to do? I run Trend Micro Scanmail services as well and It is only helping somewhat. Any suggestions on a better spam filter?