SMTPfast vs Resend.

Resend-compatible sending, plus broadcasts, forms, SMTP, and deeper SES-backed operations.

Resend set the developer-experience bar for modern transactional email. SMTPfast keeps the simple API shape while adding broader operational tools around domains, logs, SMTP submission, broadcasts, forms, and abuse controls.

SMTPfast

Free tier plus simple monthly plans tied to send volume.

SMTPfast is positioned for teams that want predictable email volume pricing and a broader SaaS operations layer.

Resend

Free tier, then subscription tiers and overage pricing.

Best for: React Email-heavy teams that want polished transactional email DX.

What SMTPfast adds

The useful differences for teams evaluating Resend.

Resend-compatible request shape for easier migration, including the Templates and Inboxes APIs.
SMTP bridge for legacy tools that cannot call a REST API.
Signup forms, suppressions, warmup gates, and admin abuse tooling.
SES-specific domain verification and custom MAIL FROM workflow.

Short verdict

Choose Resend if React Email workflow and the most polished transactional API experience are the deciding factors. Choose SMTPfast if you want a Resend-compatible path with more operational control around SES, SMTP, broadcasts, forms, suppressions, and real-time logs.

Try SMTPfast free

Feature	SMTPfast	Resend
Pricing model	Simple volume plans	Subscription tiers plus usage overages
Public free tier	3,000 emails/month	3,000 emails/month (100/day)
API & Sending
REST API
Resend-compatible payloads
SMTP relay
Batch sending	100/request
Idempotency keys		Partial
Inline images (cid) and automatic plain text
Customer webhooks
Share links for sent emails
Webhook event replay
Email metrics API
Marketing & Audience
Broadcast campaigns
Signup forms
Broken link check before sending		Not published
Spread a broadcast over hours	15 min to 72 h	Not published
Workflow automation	Planned
Dynamic segments	Planned	Audiences
Hosted templates		React Email + templates
Deliverability & Safety
DKIM/SPF/DMARC guidance
Custom MAIL FROM
Suppression management
Marketing opt-outs that keep transactional mail flowing	Per-email category	Broadcast opt-outs only
Custom tracking domain	Paid plans
Live event tail
Warmup and abuse controls
Platform Model
Inbound email	Paid plans
Inboxes with threads and drafts	Paid plans	Private beta
MCP server for AI agents
Terraform provider	Official	Community
Agent skill for coding assistants	Official	Not published
API key scopes	Per key	Full or sending only
Open source	Evaluating
Self-hostable	Evaluating
Team members and roles	Paid plans	Not published
No per-seat pricing

Choose Resend if

Your templates are built around React Email and you want that ecosystem first.
You are happy paying a premium for a very polished transactional workflow.
Your team already uses Resend and does not need SMTPfast's extra audience/form tooling.

Choose SMTPfast if

You like the Resend API but need SMTP submission too, because something in your stack only speaks SMTP.
You want the thing that sends your receipts and the thing that sends your newsletter to be one system, with one suppression list.
You want to see why a message failed without opening a support ticket, in a log that shows every retry.

Migration checklist

1Keep your current send payload shape and update the base URL/API key.
2Create an SMTPfast account and generate an API key with email:send scope.
3Add and verify your sending domain with DKIM, SPF, DMARC, and MAIL FROM records.
4Send a low-volume test message and confirm events appear in the SMTPfast logs.
5Move production traffic gradually while watching bounces, complaints, and suppressions.
6Compare webhook event names and map any existing handlers to SMTPfast events.

Frequently asked questions.

Is SMTPfast better than Resend?

SMTPfast is not trying to out-design Resend at React Email. It is a better fit when the same team also needs SMTP relay, broadcasts, signup forms, live logs, and SES-backed deliverability controls.

When should I still choose Resend?

Choose Resend when its core strength matches your team: React Email-heavy teams that want polished transactional email DX. SMTPfast is a better fit when you want a developer-first SES-backed API with queues, webhooks, tracking, suppressions, and a focused dashboard already handled.

How hard is it to migrate from Resend to SMTPfast?

Most migrations start with domain verification, a test API key, and one low-risk transactional email path. Resend-compatible payloads are especially quick to move; older providers may require mapping template, webhook, and suppression behavior.