1. block port 25 to external IP addresses for all of your customers
except those with what draft-klensin-ip-service-terms-01.txt calls
Full Internet Connectivity.
... and receive a flood of complaints because 10% of your users are
using a mail service provided by someone else than you.
2. Do not sell Full Internet Connectivity to anyone running
Microsoft
software exposed to the Internet.
Regardless of whether Microsoft's software can be secured (it can), this
is a big no-op as a PC behind a "home firewall" is still at risk from
e-mail viruses and questionable web downloads.
3. The effects of #1 and #2 include forcing all mail from the usual
suspects through your own mail systems so that you can do as the
credit card companies do. Track SMTP envelope Mail_To values or
other characteristics for each customer. When you see a change,
contact the customer by voice to check.
So the solution to Spam has to be a massive surrender of privacy!
I am afraid that you are falling in the very trap that you often
denounce, present you personal definitive solution to Spam...
-- Christian Huitema
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