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Lesson 1: how mail finds its way#

Three DNS records decide whether a message arrives. MX says where the domain's mail is delivered, SPF lists the servers that may send for it, and DKIM signs each message so the receiver can tell it was not changed on the way.

Check yourself#

Pick an answer for each question. Your score stays in this browser; try again starts over.

Self-test

Question: Which record says where a domain's mail is delivered?
Answer

MX

MX

The mail exchanger: where mail for the domain goes.

SPF

SPF lists who may send, not where mail arrives.
Question: Which record lists the servers that may send for the domain?
Answer

SPF

MX

MX is where mail arrives, not who sends it.

DKIM

DKIM signs messages; it names no servers.
Question: What does DKIM add to each message?
Answer

A signature

Your answer#

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