Email infrastructure
that explains itself.

Transactional email for your customers and your team.
One API for sign-ins, receipts, and system alerts—with delivery you can see.

Start building for free Explore the API

1,000 emails / month free No credit card required

Workspace / Overview

Interactive demo

Every message. In view.

Follow an email from your API to their inbox.

Sample data

Your APIMessage received

AuthenticatedSPF · DKIM · DMARC

Dedicated IPOptimal route selected

GmailMessage delivered

Welcome to your next chapterhello@yourapp.com alex@example.com

Delivered

Message accepted14:32:08.000

SPF, DKIM & DMARC passed14:32:08.024

Routed through dedicated IP14:32:08.086

Delivered to receiving server14:32:08.198

Message accepted by the receiving server.198 ms total

One API. Every step accounted for.Explore the platform

Fits right into the way you build.

Works with Node.jsany stack

HTTPPOST /v1/messages
SMTPsmtp.flashpost.io:587

Node.js
Python
PHP
Go
Laravel
Django
Next.js
Rails

Every email
your product runs on.

From a sign-in code to a production alert. Send customer and team messages through the same API or SMTP relay.

For your customers

Keep their next step moving.

Sign-in codes & password resets
Receipts & shipping updates
Account & security notifications

For your team

Keep everyone in the loop.

Deployments & pipeline updates
Monitoring & infrastructure alerts
Scheduled reports & daily digests

Your next email
starts with an idea.

Start with a reusable template or describe what you need. Generate a draft with AI, refine it, and make every send personal.

Template studio

Interactive example

Describe the emailAI drafts it

A warm welcome email for a new customer. Keep it simple, use our brand color, and give them one clear next step.A warm welcome email for a new customer. Keep it simple, use our brand color, and give them one clear next step.

Draft ready

Draft settingsRead from the brief

Warm toneBrand colorOne next step

PersonalizePer recipient

{{name}}{{workspace_url}}filled from your send request

HTML & text Versioned

Create your first template

Email preview Personalized for Alex

Subject

You’re in. Let’s make something great.

yourapp

A good beginning, Alex.

Your workspace is ready. Here are three small steps to make yourself at home.

1Create your first project
2Invite your team
3Connect your domain

Open your workspace

Something on your mind? Just reply. We’re here to help.

Delivery is a result.
See what’s behind it.

Three perspectives on your reputation. One place to understand what needs attention.

Sender healthSample data

A+

Healthy reputation

Your sending signals,
working together.

Gmail PostmasterGood reputation

AuthenticationPassing

Inbox placement testExample results

Gmail Inbox
Outlook Inbox
Yahoo Inbox

A health score with a next step.

A daily A+ to F grade brings your sender reputation into focus, with guidance on what to fix when it changes.

Gmail’s view, inside FlashPost.

Gmail Postmaster Tools brings domain reputation, spam rates, and authentication signals into the same workspace.

Test placement before you send.

Run inbox-placement tests across major mailbox providers to see where your email lands before it reaches customers.

Explore your deliverability tools

Every message leaves a record.

Searchable logs · Exportable history · Delivery events

Explore message logs

From your code.
To their inbox.

Follow one message through FlashPost.
Every checkpoint. A clear explanation.

Message journeyInteractive sample

CHECKPOINT 01 / 04

One request starts the journey.

Send through the API or your existing SMTP setup. A message ID connects everything that happens next.

POST/v1/messagesSample request

{
  "from": "hello@yourapp.com",
  "to": ["alex@example.com"],
  "subject": "Welcome aboard",
  "html": "<h1>You're in.</h1>"
}

Your apphello@yourapp.com

To alex@example.com

Welcome aboard

You're in.

202 AcceptedMessage ID msg_01j8k2v

CHECKPOINT 04 / 04

Every event, connected.

Follow the same message from acceptance to delivery, with events in your dashboard and webhook endpoint.

Delivery confirmedSample event history

AcceptedAdded to the queue
14:32:08
AuthenticatedSigned and aligned
14:32:08
DeliveredRecipient server accepted
14:32:09

Webhook payload200 OK

{
  "type": "message.delivered",
  "message_id": "msg_01j8k2v",
  "to": "alex@example.com"
}

One message. A complete delivery record.msg_01j8k2v

Your volume. Your needs.
The right route.

Start with a shared pool, build your own reputation, or let Smart Relay handle the unexpected.

Ship in
your language.

Use a standard HTTP request or connect your existing SMTP library on port 587 or 465. Keep the language and tools you already know.

Explore API & SMTP

Three environments. Room to build.Production, staging, and development each get separate API keys and sending limits, included from day one.
Write a template once.Reuse versioned email templates and personalize each message with variables.
Let your application react.Signed webhooks with retries keep delivery, bounce, and complaint events connected to your workflows.

Illustrative HTTP requestNo SDK required

curl -X POST https://api.flashpost.io/v1/messages \  -H "Authorization: Bearer YOUR_API_KEY" \  -H "Content-Type: application/json" \  -d '{    "from": "hello@yourapp.com",    "to": ["alex@example.com"],    "subject": "Your order is on its way",    "html": "<p>Thanks, Alex. Your order has shipped.</p>"  }'

const response = await fetch(  "https://api.flashpost.io/v1/messages",  {    method: "POST",    headers: {      Authorization: `Bearer ${process.env.FLASHPOST_API_KEY}`,      "Content-Type": "application/json",    },    body: JSON.stringify({      from: "hello@yourapp.com",      to: ["alex@example.com"],      subject: "Your order is on its way",      html: "<p>Thanks, Alex. Your order has shipped.</p>",    }),  },);if (!response.ok) throw new Error("Send request failed");const message = await response.json();

import jsonimport osfrom urllib.request import Request, urlopen request = Request(    "https://api.flashpost.io/v1/messages",    headers={        "Authorization": "Bearer " + os.environ["FLASHPOST_API_KEY"],        "Content-Type": "application/json",    },    data=json.dumps({        "from": "hello@yourapp.com",        "to": ["alex@example.com"],        "subject": "Your order is on its way",        "html": "<p>Thanks, Alex. Your order has shipped.</p>",    }).encode(),)with urlopen(request) as response:    message = json.load(response)

DevelopmentStagingProduction

Start free. Grow from there.

Start with the essentials. Add dedicated infrastructure as you grow.

Free

$0forever

1,000 emails / month

Message and audit logs
Webhook events
No credit card required

Start free

Recommended

Starter

$25/mo

50,000 emails / month

Everything in Free
Priority delivery queue
Email support

Choose Starter

Growth

$49/mo

250,000 emails / month

Everything in Starter
1 dedicated IP + managed warming
Priority support

Choose Growth

Pro

$99/mo

1,000,000 emails / month

Everything in Growth
3 dedicated IPs + Smart Relay
Phone and chat support

Choose Pro

Compare every plan in detail

Need more capacity or SSO? Talk to us about Enterprise.

Email infrastructure
that explains itself.

Every message. In view.

Works with Node.jsany stack

Every email
your product runs on.

Keep their next step moving.

Keep everyone in the loop.

Your next email
starts with an idea.

A good beginning, Alex.

Good things are on the way.

Let’s get you back in.

Delivery is a result.
See what’s behind it.

A health score with a next step.

Gmail’s view, inside FlashPost.

Test placement before you send.

From your code.
To their inbox.

One request starts the journey.

Welcome aboard

Your identity, carried with it.

A clear path to the inbox.

Every event, connected.

Your volume. Your needs.
The right route.

Ship in
your language.

Start free. Grow from there.

Free

Starter

Growth

Pro

Email infrastructurethat explains itself.

Every message. In view.

Works with Node.jsany stack

Every emailyour product runs on.

Keep their next step moving.

Keep everyone in the loop.

Your next emailstarts with an idea.

A good beginning, Alex.

Delivery is a result.See what’s behind it.

A health score with a next step.

Gmail’s view, inside FlashPost.

Test placement before you send.

From your code.To their inbox.

One request starts the journey.

Welcome aboard

Your volume. Your needs.The right route.

Ship inyour language.

Start free. Grow from there.

Free

Starter

Growth

Pro

Email infrastructure
that explains itself.

Every email
your product runs on.

Your next email
starts with an idea.

Delivery is a result.
See what’s behind it.

From your code.
To their inbox.

Your volume. Your needs.
The right route.

Ship in
your language.