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Email Delivery Pipeline
Trace one message from client submission through MX lookup, SMTP retry, filtering, and final mailbox delivery.
Sender
AUTH + submit
Outbound queue
awaiting handoff
DNS
idle
Inbound MX
not contacted
Filter
idle
Mailbox
empty
Step 1 / 7The mail client submits the message to its provider
The laptop is not delivering mail to Berlin directly. It authenticates to its own submission server, usually on port 587, and hands the message off there first.
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