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email-oauth2-proxy
An IMAP/POP/SMTP proxy that transparently adds OAuth 2.0 authentication for email clients that don't support this method.
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It is used by Fastmail (who was also developers of the standard)
I think it is not a great idea to say that it is not a good idea to not implement things that no one uses, because that is a certain way to not make more people use it.
There are some servers that support it such as Stalwart [0], though I don't know about any older servers and/or clients that support it well.
[0]: https://github.com/stalwartlabs/jmap-server
You do still need details for an authorised client, but it’s possible to use those of one that’s already approved. See the readme section that explains this aspect: https://github.com/simonrob/email-oauth2-proxy#oauth-20-clie...