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SPF, DKIM, DMARC, minus the jargon
Three records. Three jobs. Get them right and your inbox rate doubles.
SPF: who's allowed to send
List your sending IPs. Watch the 10-DNS-lookup limit.
DKIM: cryptographic signing
Proves the message wasn't tampered with in transit.
DMARC: what to do on failure
Start at p=none, monitor reports, then move to quarantine.
Common mistakes
Multiple SPF records, missing DKIM selector, no rua=.
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