Microsoft’s New Email Rules: What They Mean for Your Business
Microsoft Outlook is changing the rules — What to know about email deliverability
Starting May 5, 2025, Microsoft will begin enforcing new email authentication requirements for all senders. If your domain isn’t properly configured with SPF, DKIM, and DMARC, your emails may end up in junk folders — or be rejected entirely. This is similar to changes made by Yahoo and Google we outlined here.
Here’s what you need to know, and how to stay ahead.
What’s Changing?
Microsoft’s Outlook platform is introducing stricter checks to ensure incoming emails are legitimate. Domains that aren’t properly authenticated will fail these checks and risk getting filtered out.
Whether you send 5 or 5,000 emails a day, these changes apply to everyone.
For high-volume senders (5,000+ emails per day), this could impact mission-critical communications like:
• Transactional emails
• Invoices and reports
• Login links
• Client messages
If these aren’t hitting inboxes, your business could be losing revenue, credibility, and valuable client trust — without even realizing it.
Why Is Microsoft Doing This?
This is part of a larger industry push to combat spam, spoofing, and phishing attacks. By enforcing proper email authentication, Microsoft is making it harder for bad actors to impersonate your brand — and easier for your customers to trust what lands in their inbox.
In short: this is a good thing for security and deliverability. But it only works if your domain is properly set up.
How We Can Help
At 2Fifteen Tech, we make sure your email domain isn’t just compliant — it’s secure and optimized.
Here’s what we do:
✅ Authenticate your domain with SPF, DKIM, and DMARC
✅ Align and enforce DMARC to stop spoofing and phishing
✅ Monitor your domain for unauthorized use and delivery issues
✅ Provide full visibility into your email ecosystem
This isn’t just a technical box to check — it’s about protecting your reputation and keeping your business running smoothly.
Let’s Fix It Before It Becomes a Problem
If you’re unsure whether your domain is ready for this change, now’s the time to act.
Reach out to our team today. We’ll walk you through it, handle the technical setup, and make sure your email stays exactly where it should — in your customers’ inboxes.
Contact us to learn more about how we can help you and your business with these changes
