problem of the Internet spam consider this more of a user issue than an Internet issue we are relying on some ad-hoc defacto messaging systems (SMTP, IM) that were never designed for corporate high-integrity use you aren't going to stop spam with this version of SMTP need new messaging infrastructure with built-in authentication some work going on in IETF; please participate if you care at that level in meantime current network-level cures are worse than the disease an ISP or sysadmin blocking traffic for content is a dangerously slippery slope not clear we want to live in that kind of world yet another arms race (along w p2p, firewalls, verisign wildcards) you're in position to mention to those who might have other interests driving their behavior what can be done to help give your users plenty of client side options for filtering give operationally flavored input to IETF activities in this area adjust expectations (not to be confused with admitting defeat) advertising has been no enemy to our free (not to mention cheap) press