Resend: The Modern Way to Deliver Emails
We'd like to introduce an interesting platform that specializes in automating mass email campaigns. In our Resend review, you'll learn about its key features and tools, the benefits for developers and businesses, and real-world use cases.
What Is Resend and How It Works
Resend is a cloud-based email delivery platform for developers, launched in 2023. It's designed to simplify and accelerate the creation, testing, and execution of mass marketing and transactional email campaigns. Its key tools include an Email API and SMTP Service, as well as an email editor, contact database management options, and campaign analytics.
Resend provides ready-made SDKs for popular programming languages and frameworks. This allows you to integrate its functionality with external systems in minutes to quickly launch email campaigns and monitor their performance.
The project was founded by Zeno Rocha, Bu Kinoshita, and Jonni Lundy, and is headquartered in San Francisco, USA. The platform is rapidly growing, reaching 400,000 users in 2025. Since 2023, Resend has been supported by the renowned startup accelerator Y Combinator.
Source: resend.com
The platform offers a wide range of pricing plans, ensuring reliable email delivery without incurring unnecessary costs for senders. Its pricing for transactional emails includes four plans:
- Free (3,000 emails/month, 1 domain, 1 day of data storage, ticket support).
- Pro ($20/month, 50,000 emails/month, 10 domains, no daily limit, 3 days of data retention, ticket support).
- Scale ($90/month, 100,000 emails/month, 1,000 domains, no daily limit, dedicated IP with add-on, support via tickets and Slack).
- Enterprise (price upon request, number of emails and domains calculated individually, no daily limit, dedicated IP with add-on, priority support).
Resend also offers 3 plans for marketing emails:
- Free (1000 contacts/month, unlimited sending, 1 contact list, 1 domain, ticket support).
- Pro Marketing ($40/month, 5,000 contacts/month, unlimited sending/domains/lists, marketing analytics, ticket and Slack support).
- Enterprise (price upon request, contact count calculated individually, unlimited sending/domains/lists, marketing analytics, dedicated IP, priority support).
Users can change the number of emails and contacts, customizing the service package to their needs.
We remind you that our platform allows you to quickly and without special skills set up integrations for Resend. Combine this system with third-party services and applications, automate workflows, and get an effective ecosystem of technologies that work for your results.
Key Features and Tools
We'll describe Resend's key tools and features in more detail.
Email API
The Resend Email API interface allows you to easily integrate transactional or marketing email functionality into third-party systems. A REST API and SDK are available for these purposes, supporting 18 programming languages, frameworks, and platforms.
These include Node.js, Next.js, Python, Ruby, PHP, Laravel, Go, Java, Rust, as well as Supabase, Cloudflare, AWS Lambda, and many others. Developers can collect and analyze API traffic data in real time, and detailed logs help them quickly identify the cause of problems and fix them.
SMTP Service
The following tool makes it easy to integrate email functionality into your existing technology stack without the need for external libraries or dependencies.
SMTP Resend supports quick integration with a number of popular developer tools, including Auth0, NextAuth, Django, Laravel, WordPress, Supabase, Metabase, Liferay, and more.
To connect to the required connection, simply copy and paste the credentials, and you can start using it immediately. Several secure protocols are also available: SMTPS and STARTTLS.
Audiences
Another of Resend's most popular features helps you efficiently create and customize contact databases for email campaigns. It lets you add the necessary contacts to the platform in minutes via the API, a CSV file, or by manually uploading them.
- Automate the work of an online store or landing
- Empower through integration
- Don't spend money on programmers and integrators
- Save time by automating routine tasks
It also makes it easy to implement and flexibly manage the unsubscribe feature. A range of metrics is also available to help you track the size of your contact base, along with subscription and unsubscription trends.
Broadcasts
This tool allows you to quickly and easily create and format newsletter content using a native WYSIWYG editor. Its interface's set of commands allows you to add necessary elements (headlines, images, buttons, links, etc.) to your newsletters with a single click.
Furthermore, the WYSIWYG editor allows you to flexibly customize your newsletter design by changing cell sizes, background colors, and other parameters. Personalization through variables, layout support, and scheduled sending are also available.
Tracking and Analytics
It's worth noting the Resend email platform's built-in reporting and analytics options. They'll help you better understand your audience and improve the performance of your email campaigns.
These include tools for visualizing email campaign data, allowing you to present complex information in easy-to-understand graphics. They can also be used to track open rates, deliverability, engagement, and other KPIs, and then generate personalized insights based on these metrics.
Webhooks
Resend uses webhooks to automatically send real-time notifications about sent emails. This feature allows you to store and manage reports on all events related to your email campaigns. You can also send alerts through your app based on the event.
Benefits for Developers and Businesses
Resend's advantages make it one of the most sought-after email automation solutions for developers and businesses. Among them, the following are worth highlighting:
- Ease of use. The platform allows you to connect to API integration, create, and launch the necessary email campaigns in just a few clicks using ready-made SDKs.
- Fast and reliable delivery. Sending emails via the Email API improves deliverability, as communication between servers is faster. The Email API also bypasses most firewalls, allowing for more successful delivery.
- Real-time analytics. Resend users can track all key campaign metrics in real time. The platform provides up-to-date data on email deliveries, opens, clicks, unsubscribes, and other key metrics, and generates insights based on this data.
- Enhanced security. The developer email service is equipped with powerful security options, including several secure protocols. The Resend API protects your application from data leaks and other malicious activities.
- Scalability. Another key advantage of the platform is its potential for flexible scaling of email volumes. A wide range of plans makes it easy to select the optimal number of emails for the scale of your campaign and the size of your mailing list.
- Personalization and integrations. Resend makes it easy to personalize individual emails or entire campaigns, flexibly customizing their content, design, and sending parameters. And ready-made integrations with a wide range of external systems allow you to quickly customize any email campaign.
Practical Use Cases and Scenarios
In this section of the article, we'll discuss the most in-demand use cases and scenarios for the Resend email service in 2025.
Source: resend.com
SaaS Products
The platform's Email API is ideal for automating transactional emails, which are often sent to users of various SaaS products. These are personalized emails sent to recipients to complete a transaction or other process.
These include password recovery emails, emails with user invitations, subscription or unsubscription notifications, subscription expiration reminders, double opt-in newsletters, etc.
eCommerce
Transactional emails sent via the email API service are equally relevant for eCommerce companies. They allow businesses to automate sending various types of emails to their customers.
These include mailings with information about order creation or status updates, receipts or invoices for payment, order delivery information, etc.
Marketing
Another popular application for Resend's tools is online marketing. For this purpose, a separate category of emails — marketing emails — is offered.
Using the platform, marketers and entrepreneurs can send various types of emails to their subscribers in bulk. For example, newsletters, triggered or welcome emails, emails with product announcements, discounts, promotions and special offers, abandoned cart reminders, etc.
Internal Notifications
Finally, it's worth mentioning another important feature of Resend: internal notifications for teams and projects. The platform's API allows for quick and easy email integrations with virtually any external system: workspaces, project management services, CRMs, and so on. You can then automate the sending of messages and notifications to team members and guests.
Final Thoughts
The Resend Email API platform is a modern solution for developers looking to simplify and speed up the integration of email automation functionality into their services and applications.
Over 400,000 clients regularly use Resend tools, praising their benefits: simple and easy setup, reliable and secure emails, comprehensive analytics, scalability, and flexible pricing. The platform demonstrates high efficiency in a number of areas and application scenarios, including SaaS, eCommerce, marketing, and other areas.
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