Developer docs · InboxRatio Editorial
Resend email API: SDKs, docs and limits (2026)
Every link below points into Resend's official developer documentation and was checked on 10 September 2026. We record only what the vendor documents — a field we could not verify at the source is left out, never guessed.
From Resend's official docs · checked 10 September 2026
Docs, SDKs and limits
- Developer docs
- resend.com/docs/introduction
- API reference
- resend.com/docs/api-reference/introduction
- SDK languages
- .NETElixirGoJavaNode.jsPHPPythonRubyRustAs listed in Resend's official SDK docs
- SMTP relay
- Yes · SMTP docs
- Webhooks
- Webhook docs
- Rate limits
- The default maximum rate limit is 10 requests per second per team. Source
- Pricing page
- resend.com/pricing
From our feature matrix — documented by the vendor
API, SMTP and sending auth
- API'email API for developers' with 'full OpenAPI 3.0 specification'
- SDKs / client librariesOfficial libraries for Node.js, Python, PHP, Ruby, Go, Java, Laravel, Rust, .NET
- Public API docsPublic docs incl. 'OpenAPI spec (YAML/JSON)'
- Webhooks'webhooks' listed as a universal feature across all tiers
- SMTP APISMTP relay on all plans
- SMTP relay'SMTP relay' listed as a universal feature on all plans
- Transactional emailCore product — 'Send transactional and marketing emails at scale'
- SPF assistance'If you have a verified domain with Resend, it means you are already passing SPF and DKIM'
- DKIM setupDKIM configured as part of domain verification (same quote)
- DMARC supportDMARC guide: add TXT _dmarc record, 'start with a policy of p=none; before moving to a stricter policy'; BIMI also covered
Features checked 10 September 2026. ✓ documented · ◐ limited or plan-gated · × documented as absent · — not documented. Documentation is not a measured result — see our methodology.
Pricing snapshot
Generated from our datasets — every value verified and dated
Frequently asked questions
Where are the official Resend API docs?
Resend's official developer documentation is at https://resend.com/docs/introduction, and the API reference is at https://resend.com/docs/api-reference/introduction. Links checked on 10 September 2026.
Does Resend have an SDK for Python?
Yes. Python is among the SDK languages listed in Resend's official docs: .NET, Elixir, Go, Java, Node.js, PHP, Python, Ruby and Rust (checked 10 September 2026).
Does Resend support SMTP relay?
Yes. Resend's official docs document SMTP relay sending: https://resend.com/docs/send-with-smtp (checked 10 September 2026).
What are the Resend API rate limits?
The default maximum rate limit is 10 requests per second per team. Source: Resend's official documentation at https://resend.com/docs/api-reference/rate-limit, checked 10 September 2026.
Does Resend offer webhooks?
Yes. Resend's official docs cover webhook event notifications: https://resend.com/docs/webhooks/introduction (checked 10 September 2026).