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Essential Internet Protocols - SMTP

Diagram of e-mail flow  (PDF, PNG  )

The Case For E-mail Security - Security and Insecurity in SMTP, POP and IMAP.

Picture of the first computers to send and receive a network email, 2 PDP-10s

Email Address Internationalization IETF Working Group

SMTP TLS Transport real-time test - Live version of above example, mostly for TLS (i.e. secure) email but useful for non-TLS too