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Role of Authentication
Levels
Identity
A label
What the label refers to
Authentication
Validate the identity
Who is doing the validation
Authorization
Alloow/deny from history, opinion, enforcement
Identities
MTA IP SMTP client
EHLO Domain SMTP client
Provider IP SMTP client site
Mail-From Bounces address
From Author
Sender Posting agent
Received Handling sites
PPT Version