Email security
What are SPF, DKIM and DMARC records?
Short answer: They are three DNS records that work together to prove your emails are really from you: SPF lists approved servers, DKIM signs each message, and DMARC says what to do when checks fail.
The full answer
SPF: a list of servers allowed to send for your domain.
DKIM: a digital signature added to each email, checked against a public key in your DNS.
DMARC: a policy that ties SPF and DKIM to your visible From address and tells receivers to deliver, quarantine or reject failures.
You need all three for strong protection and good inbox placement.
Want step-by-step help? Read How to Stop Email Spoofing of Your Domain.