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Microsoft ending SMTP-AUTH for Exchange Online/MS365

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lundah:
https://techcommunity.microsoft.com/t5/exchange-team-blog/exchange-online-to-retire-basic-auth-for-client-submission-smtp/ba-p/4114750

SMTP-AUTH to MS365 will stop working in Sept. 2025. Time to upgrade/replace those legacy systems that don't support OAuth connections.

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