Why these records matter
DMARC, SPF, and DKIM help receiving mail systems understand whether messages claiming to use your domain match visible authentication rules. They reduce avoidable spoofing risk, but they do not make every email safe.
What to check
- SPF should include the systems allowed to send mail for the domain.
- DKIM should publish the public key for the selector your mail platform uses.
- DMARC should point to a policy and report destination that your team can monitor.
- MX records should match the mail service you actually use.
Common mistakes
Teams often add multiple SPF TXT records, forget a DKIM selector, or move to a strict DMARC policy before checking legitimate senders. Review records carefully and change policies in stages.
FAQ
Does DMARC stop every phishing message?
No. It helps with messages that try to use your exact domain. Lookalike domains and compromised accounts still need separate controls.
Should I test after changing DNS?
Yes. DNS changes can take time to propagate, so check again after the record has had time to update.