Just a bump to see if anyone wants to help me convert this into a custom Cloudron? Microsoft's statement is that SMTP Auth via Basic auth will be retired in September 2025. Which means SMTP via Office 365 will stop working on Cloudron if an alternative solution isn't prepared.
This utility allows you to send and receive using oAuth2.0 which would provide a straight forward solution for Cloudron apps that don't natively support it. Also, it would bypass the requirement to have Port 25 open.