Resend

An email API and SMTP platform for developers to send transactional and marketing emails at scale.

In our stackLast reviewed July 17, 2026

Best for

AI-nativeAgencies

Ease of use

Medium

Sending your first email is fast, but proper domain auth (SPF/DKIM/DMARC), templates, and webhooks take real setup time.

Interface

APIAgent-ready

Pricing

Free tier (3,000 emails/mo); paid plans from $20/mo (50,000 emails)

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How we classify tools

In our stack means we run it on live client work; Recommended means we evaluated it and would point a client to it, without hands-on usage claims; Previously used means we migrated away and say why.

Best-for chips are capped at two per tool. Ease is judged for the tool’s majority buyer: easy is productive in an afternoon, medium takes about a week of configuration, hard needs an operator. Agent-ready means it runs headlessly via API, CLI, MCP, or webhooks.

No star ratings anywhere: scores imply a measurement nobody publishes, so we give verdicts in sentences instead. Reviews are dated, pricing is verified against the vendor’s page as of that date, and paid links are disclosed where they appear.

The full methodology

About

What Resend actually is.

Resend is an email API and SMTP relay built for developers, not a marketing dashboard with an email feature bolted on. You call the REST API, drop in an SDK for Node, Python, Ruby, or another supported language, or point your existing SMTP client at it. Domain authentication (SPF, DKIM, DMARC) is still on you to set up before anything sends reliably.

It covers both sides of email: transactional sends like receipts and password resets, and marketing broadcasts to a contact list. Those two run on separate pricing meters that scale independently, worth checking closely before you commit to a plan. Inbound email parsing is included too, so replies can route back into your app instead of disappearing.

What it does

Sends email through a REST API or SMTP relay.
Official SDKs for Node, Python, PHP, Ruby, Go, Java, and more.
React Email lets you write templates as React components.
Broadcast API and dashboard for marketing sends to contact lists.
Open and link tracking, plus bounce and suppression handling.
Webhooks push delivery, open, click, and bounce events to your app.
A CLI and an MCP server let AI agents send email directly.

Official demo from Resend

In the system

Where it sits in the pipeline.

Runs well with

The tools we'd run next to Resend, and what each pairing covers.

n8nTriggers Resend sends from workflow automations without writing custom API integration code.

ZapierConnects Resend to CRMs and forms so transactional or notification emails fire on external events.AttioPushes contact and lifecycle data into Resend's audience lists to drive Broadcast API sends.

Claude CodeUsed to scaffold React Email templates and wire the Resend Node SDK into an app's backend.

What it costs

Pricing, without the fiction.

From the Resend pricing page · verified July 17, 2026

Free

$0/mo

per account, billed monthly

3,000 emails/month, 100/day limit
1 domain
10,000 automation runs
30-day log retention
5 AI credits/month
Ticket support

Pro

from $20/mo

per account, billed monthly (usage-based, scales with volume e.g. $35/mo for 100,000 emails)

Starts at 50,000 emails/month, no daily limit
Overage $0.90 per 1,000 emails
10 domains
10,000 automation runs, 30-day retention
100 AI credits/month
Ticket support

Scale

from $90/mo

per account, billed monthly (5 usage tiers up to $1,150/mo)

100,000 to 2,500,000 emails/month, no daily limit
Overage $0.90 down to $0.46 per 1,000 emails
1,000 domains
500 AI credits/month
Slack + ticket support, optional dedicated IP

Enterprise

Custom

custom contract

Custom email volume and overage pricing
Flexible domains, automation runs, retention, and AI credits
Dedicated IPs, no daily limit
Priority support

The bill is driven by two separate meters: email volume and marketing contacts, and they scale independently across tiers. Free covers 3,000 emails/month on 1 domain; Pro starts at $20/mo for higher email volume across 10 domains, and marketing contacts are priced separately on the Pro marketing plan, scaling up to 150,000; Scale runs $90 to $1,150/mo depending on volume, up to 2.5 million emails a month. Costs creep up from three places buyers often miss: per-1,000 overage charges once you exceed the plan's included volume ($0.90 on Pro and Scale's base tier, dropping to $0.46 at Scale's top tier), the $30/mo dedicated IP add-on gated to accounts over 3,000 emails/day, and automation runs beyond 10,000/month billed at $0.0015 each.

The verdict

Choose it, or skip it.

Choose it if

Dev teams already writing their own transactional email logic (signup, password reset, receipts, alerts) who want an API and SDKs instead of an SMTP relay bolted onto a marketing tool.
Teams sending under 50,000 emails a month, where the Pro plan at $20/mo covers volume without needing custom enterprise pricing.
Products built with React, since Resend's React Email library lets you write email templates as React components instead of hand-coded HTML tables.
Anyone who needs both transactional and marketing sends (via the Broadcast API) in one platform without wiring two separate vendors together.

Skip it if

Teams that need a mature marketing-email suite with visual automation builders, A/B testing, and deep segmentation - Resend's Broadcast API is basic next to tools built for that job.
Non-developers who want a no-code way to manage a sending domain and templates without touching an API or SDK.
High-volume senders who haven't priced out the overage rate - it drops as you move up tiers but is still a real per-email cost worth modeling before committing.

Alternatives

If not Resend, then what.

SmartLeadfrom $39/mo (Base plan), free trial available
Choose SmartLead when the job is cold outbound at scale across many inboxes, not transactional or product email from your own app.
Instantlyfrom ~$37-47/mo (Growth/Starter plan, billed monthly or annually); modular add-ons (leads, CRM) push real cost to $100-4
Choose Instantly when you need built-in inbox rotation and warmup for cold email campaigns rather than an API for app-triggered sends.

FAQ

Asked in real client work.

What happens if we go over our monthly email limit?

Overage is billed per 1,000 emails beyond the plan's included volume. The rate is the same on Pro and Scale's base tier ($0.90 per 1,000) and drops only on Scale's higher-volume tiers, so a sudden volume spike costs more per email than upgrading ahead of it would.

Does the free tier work for a real production app?

The free plan caps at 3,000 emails/month and 1,000 marketing contacts on 1 domain, which is enough for testing or a very early-stage product but not for anything with real signup or notification volume.

Do we need a dedicated IP for deliverability?

Dedicated IPs are a $30/mo add-on and available on Scale plans (also included with Enterprise), and Resend gates them to accounts sending over 3,000 emails a day - below that, shared IPs are the default and the recommended path.

Can Resend replace a marketing ESP entirely?

It has a Broadcast API and dashboard editor for sending to contact lists, but contact limits are tied to the plan (1,000 on Free up to 150,000 on Pro (there's no separate Scale tier for contacts)) and the automation/segmentation tooling is thinner than dedicated marketing platforms.

Is switching from another transactional provider (SendGrid, Postmark) hard?

Resend's API and SDKs are built to feel similar to those tools, and domain verification (SPF/DKIM) works the same way, but you still need to re-verify sending domains and re-point application code to the new API keys and endpoints.

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