William Herrin wrote:

Indeed, and the ones who are more than minimally competent have considered the protocol as a whole and come to understand that at a technical level the "reject don't bounce" theory has more holes in it than you can shake a stick at.

No way. You are kidding aren't you Bill? Honestly, I have not encountered a sysadmin who allows their company's mailexchangers to send backscatter in close to 8 years (outside of non-technical SMBs who also have numerous other systems and network issues, and one university hamstringed by vendor lock-in). The really issue here IMO is the RFC process. Given how badly the implementation of IPv6 is coming along it really should not surprise anyone that SMTP RFCs are no less dated and no less out of sync with real world conditions. Deja vu X.400. Roger Marquis