Look out: Outlook’s new email requirements and what they mean for Braze senders

The new authentication indonesia whatsapp number data
requirements that Outlook is introducing will apply to high-volume senders. If your domain doesn’t meet these requirements—or if something’s misconfigured—your emails could start landing in the Junk folder. And later this year, Outlook may begin to reject non-compliant messages altogether.

Here’s what Outlook will be looking for:

SPF (Sender Policy Framework): This validates which servers are authorized to send on your behalf.
DKIM (DomainKeys Identified Mail): This uses a digital signature to verify that your message hasn’t been tampered with.
DMARC (Domain-based Message Authentication, Reporting, and Conformance): This tells mailbox providers what to do if a message fails SPF or DKIM. Requires at least a p=none policy and alignment with either SPF or DKIM (ideally both).

• Good news for Braze customers

  • SPF and DKIM? Braze handles leverage existing customers
    those for you—no action needed.
  • DMARC? That’s your responsibility. You’ll need to configure this in your domain’s Domain Name Service (DNS).

  Need help getting started with DMARC? Reach out to Braze Support, and we’ll help point you in the right direction.

  In addition to the updates mentioned above, Microsoft is also recommending senders adopt some tried-and-true email best practices. These aren’t technically required yet, but their inclusion is a strong signal that the industry is heading this way. Senders who don’t eventually comply are likely to be left behind!

  Outlook email updates: Enforcement timeline

  As we get closer to the enforcement deadline, fax list
  there’s more that email marketers may need to do. Here’s what to expect:

  • Now: Start preparing ASAP. Review your SPF, DKIM, and DMARC records and make sure everything is aligned. Not sure how? Send yourself a test email and inspect the headers. If SPF, DKIM, or DMARC don’t show “pass,” something needs attention. Braze customers should reach out to their CSM or open a Support ticket for assistance.
  • May 5, 2025: Outlook begins rejecting non-compliant messages from non-compliant high-volume senders.
  • Later in 2025 (exact date TBD): Microsoft may invoke additional filtering based on email best practice recommendations

  Even if you currently send fewer than 5,000 emails per day, this is a great time to implement these best practices. Solid authentication and adherence to email best practices protects your customers, and your brand.