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Microsoft to Block Emails From Outdated Exchange Servers
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Microsoft tightens the rules for old Exchange servers: In hybrid environments, throttling and blocked emails threaten.
·Germany
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Microsoft to Block Emails From Outdated Exchange Servers
Microsoft has warned that Exchange Online will begin throttling and eventually blocking email from Exchange Server 2016 and 2019 systems that are not updated to the final public security update baseline released in October 2025. This change will begin rolling out in the second week of September 2026 and primarily affects hybrid environments that send...
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