SPF, DKIM and DMARC Explained for Sales Teams
What each record does, the exact DNS entries to publish, and how to verify alignment.
SPF: who may send for you
An SPF record is a TXT entry listing the servers allowed to send for your domain, ending in a policy such as ~all. Keep it under ten DNS lookups.
DKIM: proof nothing changed
Your provider gives you a public key to publish as a TXT record at a selector hostname. Receiving servers verify the signature on every message.
DMARC: what to do on failure
A DMARC record tells receivers how to treat mail that fails SPF or DKIM alignment, and where to send reports. Start at p=none and read the reports before tightening.
Verify alignment
Send a test to a mailbox you control, open the original headers, and confirm all three pass and that the domains align with your From address.
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