Microsoft recently announced updated email sender requirements, raising the bar to help better protect email inboxes by making email authentication a prerequisite for successful email delivery to Outlook.com.
On May 5, Microsoft will start rejecting non-compliant emails and you can read more about it here. Which is something that anyone who runs an email server should do. But here’s the TL:DR:
- Sending domains must have a published DMARC policy, with a policy setting of p=none or better, and there must be proper alignment with either SPF or DKIM authentication settings (Microsoft’s guidelines recommend both be aligned whenever possible).
- If your domains do not meet these requirements, your non-compliant emails will be rejected as of May 5.
Please note: If your domains are at enforcement (p=reject or p=quarantine), congratulations your domain is protected. However, if your DMARC policy is at p=none, your domain is not protected and is open to phishing and spoofing.
I’ll be checking my email servers over the weekend to ensure that they are compliant. You should do the same so that you have no issues on May 5th.
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This entry was posted on May 1, 2025 at 1:12 pm and is filed under Commentary with tags Microsoft. You can follow any responses to this entry through the RSS 2.0 feed.
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New Microsoft Email Sender Requirements Go Into Effect On May 5th
Microsoft recently announced updated email sender requirements, raising the bar to help better protect email inboxes by making email authentication a prerequisite for successful email delivery to Outlook.com.
On May 5, Microsoft will start rejecting non-compliant emails and you can read more about it here. Which is something that anyone who runs an email server should do. But here’s the TL:DR:
Please note: If your domains are at enforcement (p=reject or p=quarantine), congratulations your domain is protected. However, if your DMARC policy is at p=none, your domain is not protected and is open to phishing and spoofing.
I’ll be checking my email servers over the weekend to ensure that they are compliant. You should do the same so that you have no issues on May 5th.
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This entry was posted on May 1, 2025 at 1:12 pm and is filed under Commentary with tags Microsoft. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.