2025 in Email: The Year Authentication Became Mandatory Everywhere
Microsoft joined the mandate, Gmail moved to hard rejection, and DMARCbis reached the finish line. What 2025 changed for senders and what it sets up for 2026.
3 articles with this tag
Microsoft joined the mandate, Gmail moved to hard rejection, and DMARCbis reached the finish line. What 2025 changed for senders and what it sets up for 2026.
Every include, a, mx, and redirect in your SPF record costs a DNS lookup, and the budget is ten. Why records break at scale and how to fix them without flattening regret.
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.