Microsoft's New Outlook Sender Requirements: A Compliance Guide
Microsoft now requires SPF, DKIM, and DMARC from high-volume senders to Outlook consumer domains. What the rules demand, how enforcement works, and how to comply.
#DKIM
6 articles with this tag
Migrating ESPs Without Destroying Your Sender Reputation
Switching email providers resets your IPs, your DKIM keys, and every provider assumption about your traffic. A migration plan that carries your reputation across.
DKIM Replay Attacks: How Spammers Weaponize Your Valid Signatures
A DKIM signature stays valid no matter who forwards the message. How replay attacks abuse that property to spend your reputation, and the defenses that limit the damage.
Why DMARC Alignment Matters More Than DMARC Itself
DMARC fails when SPF or DKIM pass for the wrong domain. The alignment rules, relaxed vs strict modes, and the ESP configuration that fixes it.
DKIM Key Rotation: A Practical Guide for Production Environments
How to rotate DKIM keys in production without breaking signatures. Dual-selector strategy, 2048-bit key sizes, and the rotation cadence that actually works.
DKIM Explained: How a Signature Proves the Mail Is Yours
SPF authorises servers, DKIM authenticates messages. How the signing and verification cycle works, what each tag in the header does, and where signatures break.