Editorial Guide
MX vs SPF vs DKIM
Compare mail routing, sender authorization, and message signing in one plain-English guide.
MX, SPF, and DKIM are often discussed together, but they solve different problems in email infrastructure.
MX records help route inbound mail, SPF helps declare which servers may send mail for a domain, and DKIM helps validate message integrity and signing.
What MX records do
MX records tell other mail servers where inbound mail for a domain should be delivered.
What SPF does
SPF publishes sender-authorization policy so receivers can evaluate whether a sending source is expected.
What DKIM does
DKIM uses cryptographic signing so receivers can verify that a message was signed by an authorized domain and was not altered in transit.
Practical takeaway
Use MX for routing checks, SPF for sender policy, and DKIM for message-signing validation. In practice, all three may matter during delivery troubleshooting.
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