datalust/seq-app-htmlemail

Investigate support for OAUTH authentication with Office 365

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While SMTP with basic authentication remains supported on Office 365, Microsoft is pushing towards OAUTH token-based authentication for most purposes:

https://techcommunity.microsoft.com/t5/exchange-team-blog/basic-authentication-deprecation-in-exchange-online-may-2022/ba-p/3301866

This plugin may add support for this too, but more investigation is needed: it currently looks as though the differences in configuration and functionality would be significant enough to warrant development of a new/forked HTML email app for this purpose.

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