Our great sponsors
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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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WorkOS
The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.
On a serious note, I found this OAuth compatible relay on GitHub, and it looks quite interesting. This may meet your requirements - https://github.com/simonrob/email-oauth2-proxy
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.