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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.
Regarding basic auth - you're covered there, SMTP is the sole protocol where Basic Authentication will continue to work with no planned end date. However, there is a Graph SDK for PHP in case you want to check out doing things the 'modern' way - https://github.com/microsoftgraph/msgraph-sdk-php - I should note I have no experience with it.
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Hence, a higher number means a more popular project.