I've been getting loads of spam on my exchange 2000 server. The spam is coming only from the top level domain ".us" The user and the domain names appear to be randomly generated so I cannot block by those but the email contents are the same. Is there a way just using exchange itself to block anything from .us ?
I've seen directions for blocking users, domains, and sub domains by adding a filter to Global settings/message delivery/filtering. I've tried adding *@*.us but it does not seem to work.