Microsoft’s New Email Rules: Why Businesses Must Act Now
Somchai runs a successful logistics company in Bangkok.
Last month, one of his biggest clients received a fake invoice… sent from his domain.
The email looked real. It passed the client’s spam filters.
And the money? Gone.
The attacker didn’t hack him.
They spoofed his domain because Somchai’s company hadn’t implemented DMARC.
That week, Somchai lost ฿750,000, one major client, and a lot of sleep.
The New Reality for Business Email
As of May 5, 2025, Microsoft is enforcing a new policy:
If you send over 5,000 emails per day to Outlook/Hotmail/Live.com users, your domain must have:
✅ SPF
✅ DKIM
✅ DMARC
If not, your emails will land in junk or get blocked entirely.
But here’s the kicker - even if you don’t send that much, providers like Gmail are rolling out similar rules.
This isn’t optional. It’s the new standard.
What Is DMARC, and Why Should You Care?
Most people have no idea what SPF, DKIM, or DMARC actually do.
Here’s the real-world version:
SPF: tells inboxes which servers can send on your behalf
DKIM: signs your email with a digital seal of authenticity
DMARC: enforces rules, blocks fakes, and monitors threats
No DMARC? Anyone can send fake emails from your domain, and your real emails might start getting flagged too.
This Isn’t Just a Deliverability Problem, It’s a Trust Problem
Your marketing emails? Blocked.
Your invoices? Filtered.
Your customers? Losing trust — fast.
You might not even know it’s happening.
DMARC Is Not "Set and Forget"
You can’t just copy-paste a record into your DNS and call it done.
Do it wrong, and your legit emails break.
Do nothing, and spoofers walk in the front door.
Why Raso Cyber + Sendmarc Is Different
We partner with Sendmarc, global leaders in email authentication, to give Thai businesses a fully managed, pain-free rollout:
Full compliance in under 90 days
Real-time monitoring of all sending sources
Gradual enforcement with zero disruption
Continuous visibility and support
This isn’t DIY. This is done properly.
Want to Know if Your Domain is Protected?
Let’s find out.
Book your free DMARC readiness check with Raso Cyber.
We’ll show you what’s missing and how to fix it fast.
Don’t Wait Until It Costs You a Client, Or Worse
Email still drives most business.
Protect it before someone uses your name to commit fraud.