Best email APIs for Node.js in 2026

For Node.js and TypeScript apps, Unitpost ranks first on the balance of a typed SDK, a clean API and the largest free plan here. Resend and Mailgun ship the most mature SDKs, Postmark has the best deliverability record, and SendGrid's Node.js SDK hasn't had a release in over a year.

Updated November 2, 2026. We make Unitpost, and it is on this list. Every score has a reason and the weights are published below, so you can re-rank it for your own needs. How we scored

#	Product	Best for	Free plan	Score
1	Unitpost	app teams sending both kinds of email	5,000 emails a month, 200 a day, no card	4.4
2	Resend	developer-first transactional email	3,000 emails a month, 100 a day	4.2
3	Brevo	marketers who want a full suite	300 emails a day	3.9
4	Mailgun	high-volume senders and validation	100 emails a day on one domain	3.8
5	Postmark	mail that must reach the inbox	100 emails a month	3.6
6	MailerSend	a cheap first paid plan	500 emails a month, card required	3.6
7	Amazon SES	lowest cost at very high volume	None for SES; new AWS accounts get up to $200 in credits	3.4
8	SendGrid	enterprises and multi-tenant platforms	None: a 60-day trial at 100 emails a day	2.3

The official packages

Unitpost: npm install unitpost
Resend: npm install resend
Mailgun: npm install mailgun.js
Postmark: npm install postmark
Brevo: npm install @getbrevo/brevo
MailerSend: npm install mailersend
Amazon SES: npm install @aws-sdk/client-sesv2
SendGrid: npm install @sendgrid/mail

The picks

#1 · 4.4 / 5

Unitpost

Best for app teams sending both kinds of email

Transactional and marketing email on one API, one contact list and one bill, with a permanent free plan and an importer for six providers.

Pros

Permanent free plan, no card
One-key import from SendGrid, Resend, Mailgun, Postmark, Brevo and Loops
REST API, SMTP relay, MCP server and nine SDKs on every plan
Unlimited contacts on paid plans, priced by sends

Cons

A newer sender, without a long public track record
No sub-accounts, and dedicated IPs are not launched yet
SMS is on paid plans only

Free plan: 5,000 emails a month, 200 a day, no card
Paid from: $10 a month for 20,000 emails
Priced by: Emails sent

Start free See pricing

#2 · 4.2 / 5

Resend

Best for developer-first transactional email

A clean, modern email API from the team behind React Email, with inbound email and an official MCP server on every plan. Marketing contacts are billed on a separate plan.

Pros

A modern API with clear errors and many SDKs
Inbound email on every plan, free included
React Email for building templates in code

Cons

Marketing is a second plan, priced by contacts ($40 a month for 5,000)
Free sending is capped at 100 emails a day

Free plan: 3,000 emails a month, 100 a day
Paid from: $20 a month for 50,000 emails
Priced by: Sends and contacts

Unitpost vs Resend Visit Resend

#3 · 3.9 / 5

Brevo

Best for marketers who want a full suite

A marketing suite with email, SMS, WhatsApp, a CRM and automation, plus a transactional API and SMTP relay. Its free plan sends the most email here.

Pros

The largest free volume: 300 emails a day
CRM, landing pages and automation built in
Paid plans sized by email volume, from $9 a month

Cons

SMS and WhatsApp credits are bought separately
A large step in price from Standard to Professional

Free plan: 300 emails a day
Paid from: $9 a month for 5,000 emails
Priced by: Emails sent

Unitpost vs Brevo Visit Brevo

#4 · 3.8 / 5

Mailgun

Best for high-volume senders and validation

A long-running email API with address validation and inbox placement testing. Strong at volume, with marketing campaigns left to other tools.

Pros

Email validation and inbox placement testing
EU region for data residency
Proven at very high volume

Cons

The free plan keeps logs for one day, on one domain
Marketing campaigns need another tool

Free plan: 100 emails a day on one domain
Paid from: $15 a month for 10,000 emails
Priced by: Emails sent

Unitpost vs Mailgun Visit Mailgun

#5 · 3.6 / 5

Postmark

Best for mail that must reach the inbox

Transactional email known for fast, reliable inbox placement, with bulk mail kept on separate broadcast streams. It costs more, and the free plan is for testing.

Pros

The best-regarded deliverability record here
Transactional and bulk mail kept on separate streams
45 days of message content and good debugging tools

Cons

The free plan is 100 emails a month
No audience or campaign tools, and no inbound on Basic

Free plan: 100 emails a month
Paid from: $15 a month for 10,000 emails
Priced by: Emails sent

Unitpost vs Postmark Visit Postmark

#6 · 3.6 / 5

MailerSend

Best for a cheap first paid plan

A transactional email API with an official hosted MCP server and a $7 first paid plan. The free plan is small.

Pros

Hobby is $7 a month for 5,000 emails
API and SMTP on the free plan
An official hosted MCP server

Cons

500 emails a month on free
No audience or campaign tools

Free plan: 500 emails a month, card required
Paid from: $7 a month for 5,000 emails
Priced by: Emails sent

Visit MailerSend

#7 · 3.4 / 5

Amazon SES

Best for lowest cost at very high volume

Amazon's sending service, inside AWS: the lowest price per email here. You build the rest yourself, from bounce handling to templates and dashboards.

Pros

$0.10 per 1,000 emails on pay-as-you-go pricing
Runs inside your AWS account and IAM
Inbound email as well as sending

Cons

No campaign builder or audience tools
Bounce handling, dashboards and reputation work are yours

Free plan: None for SES; new AWS accounts get up to $200 in credits
Paid from: $0.10 per 1,000 emails (new accounts start on a $0.16 plan)
Priced by: Emails sent

Visit Amazon SES

#8 · 2.3 / 5

SendGrid

Best for enterprises and multi-tenant platforms

The long-running email API, now part of Twilio, with Marketing Campaigns as a separate product. Strong at scale; there is no free plan any more.

Pros

Proven at very high volume
Sub-accounts for multi-tenant platforms
Dedicated IPs from the Pro plan

Cons

No free plan: a 60-day trial, then from $19.95 a month
Marketing Campaigns is a separate product and plan

Free plan: None: a 60-day trial at 100 emails a day
Paid from: $19.95 a month (Essentials)
Priced by: Sends and contacts

Unitpost vs SendGrid Visit SendGrid

Scores side by side

Product	Node.js SDK30%	Developer experience20%	Free plan20%	Deliverability15%	First paid step15%	Total
Unitpost	4	5	5	3	5	4.4
Resend	5	5	4	3	3	4.2
Brevo	4	3	5	3	4	3.9
Mailgun	5	3	3	4	3	3.8
Postmark	4	4	2	5	3	3.6
MailerSend	4	4	2	3	5	3.6
Amazon SES	4	3	2	3	5	3.4
SendGrid	2	3	1	4	2	2.3

How we scored

This list is for developers sending email from Node.js or TypeScript: a Next.js route, an Express or Fastify server, a queue worker or a serverless function. The SDK weighs most: official, typed and released in the last year.

Node.js SDK (30%). An official Node.js SDK with TypeScript types, released in the last 12 months.
Developer experience (20%). A clear REST API, current SDKs, readable errors and docs.
Free plan (20%). A permanent free plan large enough to run a small app on, with no card.
Deliverability (15%). A long public record of inbox placement, and the tooling to protect it.
First paid step (15%). A cheap first paid plan that grows with sends.

Each product gets 1 to 5 per criterion, from its own pricing and docs pages. The total is the weighted mean, so changing a weight re-ranks the list.

Why Unitpost scored 4.4

Node.js SDK: 4/5. The unitpost package (0.4, October 2026) ships TypeScript types for Node 18 and up; still before 1.0.
Developer experience: 5/5. Bearer-token REST API, nine SDKs, a CLI and an MCP server, with idempotency keys on sends.
Free plan: 5/5. 5,000 emails a month free for good, 200 a day, no card.
Deliverability: 3/5. Guided SPF, DKIM and DMARC with continuous checks, but a short public record so far.
First paid step: 5/5. $10 a month for 20,000 emails, priced by sends.

Checked November 2, 2026 against unitpost.com/pricing, unitpost.com/sms, registry.npmjs.org/unitpost.

Why Resend scored 4.2

Node.js SDK: 5/5. The resend package, released October 2026, with TypeScript types.
Developer experience: 5/5. The API many newer providers copy, with SDKs across most languages.
Free plan: 4/5. 3,000 emails a month free, capped at 100 a day.
Deliverability: 3/5. A shorter public record than SendGrid or Postmark.
First paid step: 3/5. Pro is $20 a month for 50,000 emails; marketing contacts are a second plan.

Checked November 2, 2026 against resend.com/pricing, resend.com/migrate, resend.com/docs/dashboard/receiving/introduction, github.com/resend/mcp-send-email, resend.com/docs/send-with-smtp, resend.com/docs/api-reference/api-keys/create-api-key, registry.npmjs.org/resend, resend.com/docs/dashboard/webhooks/retries-and-replays.

Why Brevo scored 3.9

Node.js SDK: 4/5. @getbrevo/brevo, released October 2026, TypeScript-first.
Developer experience: 3/5. A full API and SMTP relay, shaped by the marketing suite rather than built for developers first.
Free plan: 5/5. 300 emails a day, about 9,000 a month, on a permanent free plan.
Deliverability: 3/5. An established sender, without Postmark's public time-to-inbox record.
First paid step: 4/5. Starter from $9 a month, sized by email volume.

Checked November 2, 2026 against brevo.com/pricing/, developers.brevo.com/docs/mcp-protocol, help.brevo.com/hc/en-us/articles/7959631848850, help.brevo.com/hc/en-us/articles/360021533839, registry.npmjs.org/@getbrevo/brevo.

Why Mailgun scored 3.8

Node.js SDK: 5/5. mailgun.js, released November 2026, with TypeScript types.
Developer experience: 3/5. A capable API on HTTP Basic auth, with a surface shaped by long history.
Free plan: 3/5. A free plan of 100 emails a day on one domain, with one day of logs.
Deliverability: 4/5. Validation, inbox placement tests and dedicated IPs.
First paid step: 3/5. Basic from $15 a month for 10,000 emails.

Checked November 2, 2026 against mailgun.com/pricing/, mailgun.com/resources/guides/migrating-from-sendgrid-to-mailgun-email-api/, documentation.mailgun.com/docs/mailgun/mcp, documentation.mailgun.com/docs/mailgun/user-manual/sending-messages/send-smtp, registry.npmjs.org/mailgun.js, documentation.mailgun.com/docs/mailgun/user-manual/receive-forward-store/receive-http.

Why Postmark scored 3.6

Node.js SDK: 4/5. The postmark package, released July 2026, with TypeScript types.
Developer experience: 4/5. A mature, well-documented API with official libraries.
Free plan: 2/5. 100 emails a month free, enough to test, not to run an app.
Deliverability: 5/5. A long public record of time-to-inbox, protected by separate streams.
First paid step: 3/5. Basic is $15 a month for 10,000 emails.

Checked November 2, 2026 against postmarkapp.com/pricing, postmarkapp.com/migration-guides, postmarkapp.com/lp/mcp, postmarkapp.com/developer/user-guide/send-email-with-smtp, registry.npmjs.org/postmark, postmarkapp.com/developer/webhooks/inbound-webhook.

Why MailerSend scored 3.6

Node.js SDK: 4/5. The mailersend package, released November 2026, with typings.
Developer experience: 4/5. A modern REST API, SMTP and an official MCP server.
Free plan: 2/5. 500 emails a month on one domain.
Deliverability: 3/5. An established sender, without a long public inbox-placement record.
First paid step: 5/5. Hobby is $7 a month for 5,000 emails.

Checked November 2, 2026 against mailersend.com/pricing, developers.mailersend.com/mcp, mailersend.com/help/smtp-relay, mailersend.com/features/inbound-emails, developers.mailersend.com/api/v1/webhooks.html, registry.npmjs.org/mailersend, developers.mailersend.com/api/v1/inbound.

Why Amazon SES scored 3.4

Node.js SDK: 4/5. @aws-sdk/client-sesv2, released October 2026, typed; IAM setup comes with it.
Developer experience: 3/5. AWS SDKs and IAM: powerful, with more setup than an email API.
Free plan: 2/5. No SES free tier; new AWS accounts get up to $200 in credits.
Deliverability: 3/5. Good infrastructure, but reputation monitoring is your job.
First paid step: 5/5. Pay per email from $0.10 per 1,000, with no monthly minimum.

Checked November 2, 2026 against aws.amazon.com/ses/pricing/, docs.aws.amazon.com/ses/latest/dg/smtp-connect.html, docs.aws.amazon.com/ses/latest/dg/smtp-credentials.html, docs.aws.amazon.com/ses/latest/dg/vdm-dashboard.html, registry.npmjs.org/@aws-sdk/client-sesv2, docs.aws.amazon.com/ses/latest/dg/receiving-email-notifications-contents.html.

Why SendGrid scored 2.3

Node.js SDK: 2/5. @sendgrid/mail's last release was September 2025, over a year ago; types ship in the package.
Developer experience: 3/5. A large API with SDKs, shaped by a decade of backwards compatibility.
Free plan: 1/5. No free plan: a 60-day trial at 100 emails a day, then from $19.95 a month.
Deliverability: 4/5. A long track record, with dedicated IPs from the Pro plan.
First paid step: 2/5. Plans start at $19.95 a month (Essentials) once the 60-day trial ends.

Checked November 2, 2026 against twilio.com/en-us/products/email-api/pricing, twilio.com/docs/sendgrid/for-developers/sending-email/integrating-with-the-smtp-api, twilio.com/docs/sendgrid/ui/analytics-and-reporting/email-activity-feed, registry.npmjs.org/@sendgrid/mail, twilio.com/docs/sendgrid/for-developers/parsing-email/inbound-email.

Frequently asked questions

Do I need an SDK to send email from Node.js?

No. Every API on this list takes a JSON POST with fetch, and most also offer SMTP for Nodemailer. An SDK adds types, retries and webhook verification helpers, so it's worth it when it's maintained and typed.

Which email SDK works in serverless and edge functions?

SDKs built on fetch run in serverless functions; check the package's runtime notes before an edge runtime. A plain fetch to the REST API works everywhere, which is the fallback when an SDK pulls in Node-only modules.

Go deeper: Transactional email services · Free email APIs · SMTP setup guides

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