Outlook.com Postmaster
Summary
Microsoft introduces a new Outlook.com Postmaster site for IT professionals who manage mail flow to and from Outlook.com. The site provides guidance on deliverability, spam, phishing reporting, and SMTP error codes. Microsoft also announces stricter authentication requirements for high-volume senders starting May 5, 2025, including SPF, DKIM, and DMARC enforcement for domains sending over 5,000 emails per day. Non-compliant mail will go to the junk folder, and Microsoft plans to reject messages later if DNS records are not corrected. The update aims to improve sender reputation and inbox placement for legitimate email traffic.
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Accounting and Taxes
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Codeplex Foundation
$1B+
Microsoft
$1B+