Build, test, and send transactional emails at scale. Resend provides the best developer experience helping you reach users instead of spam folders.
Intent
I need it when
Integrate email sending into applications with minimal latency and high reliability
Resend offers SDKs for 10+ programming languages, REST API, SMTP relay, and batch sending capabilities. Multi-region sending reduces latency by routing emails from the region closest to recipients. Automatic queueing and throttling optimize deliverability for high-volume sends without manual configuration.
Track email delivery, engagement, and troubleshoot deliverability issues in real-time
Resend provides comprehensive webhooks for email events (delivered, opened, clicked, bounced, complained), detailed analytics dashboards showing open/click rates and engagement per recipient, DNS monitoring, DMARC/SPF/DKIM authentication, and proactive blocklist tracking to maintain domain reputation.
Send transactional and marketing emails reliably at scale without managing email infrastructure
Resend provides a fully managed email API with battle-tested infrastructure, automatic IP warming, multi-region sending, and deliverability monitoring. Developers can send emails via REST API, SMTP, or SDKs (Node.js, Python, Ruby, Go, PHP, Java, etc.) with minimal setup, reducing time to inbox and eliminating infrastructure management overhead.
Build and send beautiful, responsive emails using modern development practices
Resend enables developers to create email templates using React components via react-email, eliminating HTML table layouts. Templates can be written in code, tested locally, and versioned with the application. A modern WYSIWYG editor is also available for non-developers to compose broadcasts without coding.
Manage subscriber lists and send targeted email campaigns to segmented audiences
Resend Audiences feature allows importing contacts via CSV, API, or manual entry with custom properties. Broadcasts can be sent to audience segments with unsubscribe handling, automatic suppression of bounced addresses, and analytics showing per-contact engagement and opt-out metrics.
Drop
Not a fit when
User needs to send emails without any code integration or API knowledge—Resend is developer-focused and requires programming skills or SDK implementation
User requires on-premise or self-hosted email infrastructure—Resend is a cloud-based SaaS platform only
User needs advanced email marketing automation workflows beyond basic broadcasts and automations—Resend is optimized for transactional and marketing emails but lacks enterprise marketing automation depth
User operates in a region without access to Resend's supported sending regions (North America, South America, Europe, Asia)—multi-region support is limited
User requires unlimited email storage or data retention beyond 30 days on standard plans—data retention is limited unless on Enterprise plan