Internet Message Protocol Layers

Host

Host

Originator

Router

Mail Relay Host

Recipient

IP

Network

Service

TCP

Transport

RFC 822

IP

Network

Service

MIME

SMTP

S/MIME

Content

RFC 822

MIME

TCP

Transport

IP

Network

Service

SMTP

S/MIME

Content

Mail Routing

SMTP SMTP

TCP

Transport

IP

Network

Service

TCP

Transport

IP

Network

Service

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