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plMail could only sign people in with a local password. On an install that already runs Authentik or Keycloak, that is one more account and password per person, outside the provider's access policy. A second authenticator on the `main` firewall, beside the password form. Both end in the same token for the same User, so the user checker, the login throttle and TOTP two-factor apply unchanged. Authorization code flow with PKCE, state and nonce on league/oauth2-client's GenericProvider; endpoints come from the provider's discovery document. - Set up under a new Admin → SSO tab; the OIDC_* variables are the fallback for an install configured from its compose file, and a saved provider wins whole. This lets an administrator who points it at a provider of their own sign in as any account without a second factor; the security model says so. - The ID token's signature is not verified: it only ever comes from the token endpoint over TLS (OIDC Core § 3.1.3.7 step 6). So the issuer and endpoints must be https and no request to the provider follows a redirect. Accepting an ID token from anywhere else needs JWKS verification first. - An account is linked by (issuer, sub). The address is used for the first link only, and only when the provider reports it verified. - Auto-creation is off by default and creates an ordinary account with no usable password. - app:user:oidc-unlink forgets a link from the console, for somebody deleted and re-added at the provider. Migration: two nullable columns and a unique index on `user`, and a one-row table `oidc_config`. Nothing backfilled; reversible. Not run: Playwright on this branch. No automated test makes a round trip against a real provider; that was checked by hand on a local test stack. Closes #91 Co-Authored-By: Paul Lützner <mail@pluetzner.de> Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>