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Page 3: Anti-spam framework

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The first thing you learn about security protocols.

In the world of email:

argument about which identity to use

authentication more difficult than usual
no prior relationship with the entity you are authenticating

unusual authentication systems required
must be very scalable (more so than PGP)
must be very cheap (more so than TLS)
per-MTA cost rather than per-user cost

hence reputation and accreditation services are used
as basis for authorization decision
authentication useless against spam without reputation!

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