// 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.