Microsoft enforces strict rules for bulk emails on Outlook

stapp · May 6, 2025

Microsoft has made a change to its email service to reduce spoofing, phishing, and spam activity. The new rules are designed to filter bulk emails that are sent to Outlook users, this will help reduce unwanted mails.
Companies and admins who send more than 5000 emails per day to Outlook addresses will need to adhere to the new authentication protocols. Senders must meticulously configure a Sender Policy Framework (SPF) and the domain's DNS record must specify which IP addresses/hosts that are authorized to send emails on their behalf.
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Starting today, any sender dispatching more than 5,000 emails per day without proper configuration of SPF, DKIM, and DMARC will find their messages bouncing back rather than being directed to spam folders. In other words, if a sender fails to meet the new rules, the emails may not arrive in the recipient's inbox
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https://www.ghacks.net/2025/05/06/microsoft-enforces-strict-rules-for-bulk-emails-on-outlook/

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Microsoft enforces strict rules for bulk emails on Outlook

stapp Global Moderator

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Microsoft enforces strict rules for bulk emails on Outlook

stapp Global Moderator

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