// Fundamentals
SPF
What is SPF?
The digital bouncer for your domain — who is allowed to send mail in your name?
DKIM
What is DKIM?
The cryptographic signature that proves: this email has not been tampered with.
DMARC
What is DMARC?
The conductor that ties SPF and DKIM together — and tells recipients what should happen with forgeries.
// Practice
Guide
DMARC policy guide
The safe path from p=none via p=quarantine to p=reject — without delivery failures.
BIMI
Setting up BIMI
Your logo right in the inbox — more trust, higher open rates.
MTA-STS
Setting up MTA-STS
Enforce TLS for incoming email — protection against downgrade attacks.
TLS-RPT
Understanding TLS-RPT
Learn to read failure reports — JSON structure, common error codes, practical analysis.
DMARC reports
Interpreting DMARC reports
Read XML aggregate reports instead of just collecting them — fields, patterns, clear recommendations.