Resend
Enter a valid instance URL (https:// is required unless it is localhost).
cinatra install cinatra-ai/resend-connector
Resend
Send transactional and platform email through Resend from a single verified sending domain. Once connected, password resets, email verification messages, and any agent or workflow that sends mail flow through your Resend account with a consistent From address.
Setup: In your Cinatra instance, go to Connectors → Resend and paste a Resend API key (starts with re_). The connector defaults to sending from no-reply@mail.cinatra.ai; set a custom From address and optional Reply-To in the same settings page. Your sending domain must be verified in Resend before messages will deliver. The API key is encrypted at rest using the instance encryption key and never stored in plaintext.
Configuration: Two credential sources are supported. Set RESEND_API_KEY in the instance environment, or paste an override key in the in-app settings page. The in-app override takes precedence; if it cannot be decrypted (for example after an encryption key rotation), the connector reports not_connected rather than silently falling back to the environment variable. Clear the override in settings to restore the environment variable path.
Usage: The connector handles all email dispatched by the Cinatra platform: authentication flows (password reset, email verification, change-email), and any agent or workflow action that sends mail. The From address is always the instance-configured address — per-message From overrides are not supported because Resend requires a verified sending domain. Up to 50 recipients (combined To, Cc, and Bcc) are allowed per message.
Development: pnpm test runs the Vitest suite. The connector exports sendViaResend, getResendConfig, saveResendConfig, resolveResendApiKey, and getResendStatus for direct use in tests and the host.
Troubleshooting: If the status shows not_connected, check that an API key is set and that the sending domain is verified in Resend. If the key decryption error appears, re-enter the API key in the settings page to re-encrypt it under the current encryption key.
Works with
- Cinatra (email-connector runtime, instance-scoped credentials)
Capabilities
- Send transactional and platform email from your workspace through Resend
- Deliver password resets, email verification, and change-email messages issued by Cinatra's sign-in flow
- Use Resend as the active provider for agents and workflows that send mail
- Set a workspace-wide From address and optional Reply-To
- ci: add truthful-attribution-gate in WARN mode (#15)
- ci: adopt the reusable extension->host IoC conformance gate (org-wide rollout) (#16)
- ci: tag-driven GitHub release on v* (#17)
- ci: adopt secret-scan-gate (#18)
- release: v0.1.2 (#19)
- ci: adopt source-leak-gate (#1)
- ci: adopt source-leak-gate (#2)
- chore: add .gitignore (#3)
- ci: adopt org gates — SHA-pin all uses: refs, bump source-leak-gate to v0.1.0, add actions-pinned + gitignore gate callers (#4)
- chore: keep internal planning notes untracked (#5)
- Self-bind host deps at serverEntry activation; mark the definition instance-scoped (#6)
- chore: npm files allowlist + source-archive export-ignore hygiene (#56 standard) (#7)
- ci(release): grant contents: write + pin reusable workflow to .github HEAD (#8)
- chore: Configure Renovate (#9)
- ci: repin reusable release workflow (immutable-safe decoration + corrected build-input provisioning) (#11)
- release: resend-connector v0.1.1 (republish on corrected serverEntry build pipeline) (#12)
- ci: repin reusable release workflow to .github@21f807e7 (#13)
- resend-connector: pin required dep edge to exact promoted version (#14)
- Initial release.
- Unreleased
- docs(readme): expand README to the org standard (#20) (#21)
- ci: adopt source-leak-gate (#22)
- ci: adopt source-leak-gate (#23)
- chore: strip private engineering-tracker refs from public source (#24)
- chore: strip private tracker references from workflow comments (#27)
- ci(release): pin reusable-extension-release to gated v0.1.1 (release-approval wall) (#28)
- chore: add cinatra.vendor and displayName connector metadata (#30)
- chore(deps): declare cinatra.consumes for closure-gate enrollment (#31)
- test: add unit tests for mail-send safety logic (#29) (#32)
- chore(deps): declare cross-extension dependency as a semver range (#33)
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