Microsoft 365 has been planning to eliminate basic authentication in its email services for a few years now, and they are currently on track for that to occur in October of this year.
Here's their most recently blog post on the matter: https://techcommunity.microsoft.com/t5/exchange-team-blog/basic-authentication-deprecation-in-exchange-online-may-2022/ba-p/3301866
Will PRTG add support for Modern Authentication (OAUTH) in its various mail sensors in the future?
For example the SMTP&IMAP Round Trip and SMTP&POP3 Round Trip sensors https://www.paessler.com/manuals/prtg/smtp_imap_round_trip_sensor https://www.paessler.com/manuals/prtg/smtp_pop3_round_trip_sensor
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