Resend: Developer email sending with APIs, SMTP, and audience tools.

At a glance

Best for: Resend is best for developers who need reliable transactional email with minimal deliverability overhead.
Pricing: Free; Pro $20/month; Business $100/month; Enterprise custom
API: Yes — Resend offers a REST API to send and manage emails programmatically.

Highlights

Offers both Email API and SMTP Service, so teams can choose code-first or legacy-friendly integration.
Combines sending with Audiences, Contact Management, and unsubscribe handling instead of forcing a separate list tool.
Includes Webhooks and an Analytics Dashboard for event-driven workflows and delivery visibility.
Supports Inbound and Sending & receiving, which is useful for reply handling and email-based workflows.
Provides Multi-region Delivery and Dedicated IPs for teams that care about deliverability control.

What does Resend do?

Resend is an email sending platform for developers who need to send transactional and marketing messages from applications without wrestling with deliverability plumbing. It is built for engineering teams that want a modern way to reach inboxes, manage contacts, and automate email workflows through code. The product shows a simple developer experience, with SDKs, REST, and SMTP options that fit into existing stacks. Its core features include Email API, SMTP Service, Webhooks, Analytics Dashboard, Contact Management, Email Templates, Audiences, Broadcasts, Inbound, and Automations. Resend also supports Multi-region Delivery, Dynamic Suppression Lists, Dedicated IPs, and sending/receiving workflows. Customers shown on the site include Vercel, Replit, Gumroad, Warner Bros, and Infisical. The platform also offers a REST API for programmatic email management and can be used through SDKs or SMTP.

Who is Resend for?

Backend engineers who need to send transactional email from product code.
Startup developers who want a fast setup for templates, contacts, and delivery tracking.
Growth teams who need broadcast sending and audience management in one place.
Platform engineers who need webhooks, suppression handling, and multi-region delivery.

What are Resend's key features?

Email API

Send and manage email programmatically through a REST API, with SDK support for common languages so product teams can ship email from code.

SMTP Service

Use SMTP relay when an app or legacy system already speaks SMTP, giving teams a familiar integration path without changing their mail flow.

Webhooks

Receive delivery and engagement events for opens, clicks, bounces, and other email activity, so internal tools can react in real time.

Analytics Dashboard

Track delivery and engagement trends in the dashboard, helping teams spot bounce issues, monitor unsubscribes, and review audience growth.

Contact Management

Create, update, unsubscribe, and delete contacts through the dashboard or API, keeping recipient data organized and current.

Email Templates

Build reusable templates for transactional and marketing messages, reducing duplicated code and keeping email design consistent across sends.

Audiences

Group contacts in one place, import lists by CSV or API, and manage unsubscribe status for cleaner targeting and list hygiene.

Multi-region Delivery

Deliver email across multiple regions to support global sending needs and reduce dependence on a single delivery location.

How is Resend used in practice?

Product email delivery

Backend engineers use Resend to send password resets, magic links, and receipts from application code, using the Email API to keep delivery inside their stack. Webhooks help them react to opens, clicks, and bounces without building a separate email system.

Audience broadcasts

Growth teams use Resend to manage subscriber lists and send announcements with Broadcasts, while Audiences keeps contacts organized and unsubscribe handling automatic. That lets them run campaigns without manually cleaning lists or chasing opt-outs.

Inbound workflows

Platform engineers use Resend to receive replies and route incoming messages with Inbound and Sending & receiving. They can connect email events to internal systems through Webhooks, then monitor activity in the Analytics Dashboard.

How does Resend work?

Connect your application to the Email API or SMTP Service from the dashboard, then generate an API key and point your first sending field at Resend.
Create Email Templates for transactional messages or Broadcasts, using the template editor to standardize branding and keep message content reusable across sends.
Import contacts into Audiences with CSV upload, Create contacts via API, or manual entry, then organize recipients for targeted sends and suppression control.
Turn on Webhooks and Analytics Dashboard tracking to watch delivery, opens, clicks, bounces, and unsubscribe events as messages move through the system.
Use Automations, Inbound, and Multi-region Delivery to route replies, trigger follow-up flows, and keep email operations running across regions.

How much does Resend cost?

Free

Limited API calls
Basic email sending
Access to templates

Pro

$20/month

Increased API calls
Custom branding
Enhanced support

Business

$100/month

Unlimited API calls
Dedicated IP
Custom integrations

Enterprise

Custom

All Pro features
Custom SLAs
Priority support

Frequently asked questions

What does Resend do?

Resend is a modern email sending platform for developers. It handles transactional and marketing email, plus contact management, analytics, and webhooks, so teams can send from code and monitor what happens after delivery.

Does Resend have an API?

Yes. Resend offers a REST API for sending and managing emails programmatically. The platform also supports SDKs and SMTP, so teams can integrate it in the way that best fits their application.

Can I use SMTP with Resend?

Yes. Resend includes an SMTP Service alongside its API. That gives teams a familiar relay option if they already have SMTP-based infrastructure or want a simpler migration path.

Is there a free plan?

Yes. Resend has a Free plan, and the pricing page shows 3,000 emails per month on that plan. It also includes sending and receiving, ticket support, 10,000 automation runs, and 30-day data retention.

What integrations does Resend support?

Resend's published integration names include Slack, GitHub, Zapier, Stripe, and Discord. The support page also mentions a dedicated Slack channel for working directly with Resend engineers.

Is Resend secure and compliant?

Yes. Resend says it is GDPR compliant and SOC 2 Type II certified. Its security page also notes encryption at rest, TLS 1.3 or higher in transit, backups, and penetration testing.

Can I import contacts into Audiences?

Yes. Resend lets you import contacts with CSV files, through the API, or manually in the dashboard. The Audiences feature also provides field mapping, visibility into contact attributes, and unsubscribe management.

Does Resend handle unsubscribes automatically?

Yes. Resend automatically manages the unsubscribe flow, and contacts who opt out are skipped on the next Broadcast. The Audiences page also shows unsubscribe status and audience metrics over time.

What support does Resend offer?

Resend offers documentation, a knowledge base, email support, and live chat according to its FAQ. The support page also shows direct access to product engineers and a dedicated Slack channel for some customers.

Editor's read

Check whether the Free plan's limited API calls are enough for your send volume, since Pro only raises the cap and Business is where unlimited API calls and Dedicated IP appear. If deliverability control matters, verify whether you need those Business-tier features before committing.