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Resend

Developer-focused email platform for transactional and marketing email delivery, broadcasts, contact management, webhooks, and React-based email authoring.

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About Resend

Developer-focused email platform for transactional and marketing email delivery, broadcasts, contact management, webhooks, and React-based email authoring.

Products

  • Resend

    Email & CommunicationsFrom $20/month

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    Email API and dashboard for delivering transactional and marketing emails at scale, featuring SDKs, React-based authoring, webhooks, and audience management.

What customers say

“Resend is transforming email for developers. Simple interface, easy integrations, handy templates. What else could we ask for.”
CustomerResend customer

  • Resend reports that Paper expanded from pre-launch invitations to all transactional emails and regular 150,000-email marketing blasts. Paper credits Resend's ramp-up guidance with helping it increase sending volume while…

    Case study

  • Resend reports that Better Auth expanded from waitlist confirmations to official demos, internal products, infrastructure invites, marketing broadcasts and investor updates. Better Auth says the integration also reduced…

    Case study

  • Resend reports that Raycast migrated from SendGrid, beginning with an iOS and Windows waitlist-email test completed in 30 minutes. Raycast then expanded to app invitations, waitlist communications, marketing emails,…

    Case study

Security and compliance

As reported by Resend. Ask for audit reports before you buy.

Subprocessors21st, Amboras, Inc., Anara, Approxima, Atlas, Blaxel, Blink, Cerenovus, Clearly AI, CodeWisp, Combinely, Context.dev, Conveo, Cosine, Dench, Donkey, ED1TH, Ember AI, Enjamb Labs, Happenstance, Inkeep, InsForge, Kilvin, Kita, Last Accounting Company, LemonLime, Magai, Manaflow, Maxi, Midrender, Mistral, Ontora, Ossus, Outlit, Prism, ProhostAI, Quantstruct, Quotain, Rastro AI, Rehearsals, Siftly, Stillwind, Stratify, TesterArmy, Tinfoil, Trelium, Trope, Weave, Skill Studio AI, Agent FM, Marengo, TryNearby, GitCafe, Litmus, Tsenta, Archidian, OpenHack, Inc., Frontrunner, UXDuck, Latent, Caveman, Pomerado, Resin EDA, Ploid, Invertix, Hopper, Mirrors, Boat, Agent 37, Voyager, GrayPass, ObsessionDB, Rystic, Sentient OS, Numbers Game, Agent Relay, Orgo, Audora

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Latest updates from Resend

New feature

Launch of Official Resend Plugin for Codex

Resend has launched an official plugin for the Codex AI platform. The plugin allows users to manage email tasks directly within the Codex interface, including sending transactional emails, debugging deliverability via logs, managing contact segments, scheduling broadcasts, and monitoring API key status. It consolidates previous separate MCP server and skill installations into a single, Oauth-authenticated connector for a more unified developer experience.

IntegrationCodex
Security

Resend Announces GitHub Secret Scanning Partnership

Resend has become an official GitHub secret scanning partner. The integration automatically monitors public repositories, gists, and issues for leaked Resend API keys. Upon detection, Resend automatically revokes the exposed key and notifies account administrators, helping to prevent unauthorized email sending and domain reputation damage. This security feature is enabled by default for all Resend accounts.

PartnerGitHub, Inc.
New feature

Introduction of OAuth 2.1 Support for Resend API

Resend has introduced support for OAuth 2.1 and PKCE, enabling third-party developers to build authenticated integrations without requiring direct access to user API keys. The new system supports scoped access tokens and dynamic client registration, targeting use cases such as desktop tools, CLI utilities, and AI agent hosts. Initial integrations leveraging this technology include the Charm CLI tool and the Raycast Resend extension.

MentionedCharmIntegrationRaycast
New feature

Resend Connector Launched for Claude

Resend has launched as a one-click connector within the Claude AI connector directory. This integration allows users to connect their Resend account using OAuth to manage email tasks—including sending emails, managing contacts, and checking domain status—directly within Claude conversations. The connector utilizes the existing Resend remote MCP server to provide full platform access to Claude users.

IntegrationClaude
New feature

Message-ID Header Support Added for Email Webhooks and APIs

Resend now includes the 'Message-ID' header in all email-related webhooks and GET email API endpoints. This addition enables developers to perform threaded replies, match inbound replies to original messages, and correlate email delivery across multiple systems, including mail server logs and database records. The header is captured and exposed immediately upon email sending events.