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Default Microsoft 365 Domains Face 100-Email Daily Limit Starting October

Summary by slashdot.org
Organizations still using default Microsoft 365 email domains face severe throttling starting this October. The restrictions target the onmicrosoft.com domain that Microsoft 365 automatically assigns to new tenants, limiting external messages to 100 recipients per day starting October 15. Microsoft blames spammers who exploit new tenants for quick spam bursts before detection. Affected organizations must acquire custom domains and update primary…
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Techzine Europe broke the news in on Friday, August 22, 2025.
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