Action required: Microsoft is enforcing new email standards

“Microsoft’s update is a strong signal that the email ecosystem is maturing. These new requirements aren’t just about compliance—they’re about customer trust. High-volume senders need to step up and treat deliverability and authentication as core parts of their digital brand strategy, not just IT hygiene.”

“While Microsoft’s new requirements apply to bulk senders, I believe every domain should have SPF, DKIM, and DMARC in place. These aren’t just technical best practices — they’re essential for protecting deliverability and reputation. Microsoft themselves say it best: ‘All senders benefit from these practices.’ It’s time the industry starts moving in that direction.”

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What Are the Microsoft DMARC Requirements?

The Microsoft DMARC news comes more than a year after the Google and Yahoo announcements on October 3, 2023, but largely mirrors the requirements set by both companies.

From May 5, 2025, Microsoft will begin enforcing stricter email authentication standards for outlook.com. Bulk senders must now implement the following:

SPF helps prevent spammers from sending messages on behalf of your organization’s domain. It does this by specifying which IP addresses are authorized to send email from a domain.