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Developer-First Email Infrastructure

Ship transactional email
without building the infrastructure.

AuthyEngine gives your application a production-ready email delivery layer with APIs, verified domains, API keys, and flexible SMTP routing.

Start building free See how it works
Built for transactional email and modern application workflows.
POST /api/v1/emails/YOUR_API_KEY
{
  "name": "John Deo",
  "email": "hello@yourdomain.com",
  "subject": "Welcome to your app",
  "html": {
    "message": "<h1>Welcome!</h1>"
  }
}
200 OK  { "id": "em_01...", "status": "queued" }

Everything your app needs to send.

Keep your product focused while AuthyEngine handles the email delivery layer.

API-first delivery

Build transactional email directly into your application through a simple developer-focused API.

Verified domains

Connect your sending domains and keep credentials and sending configuration organized.

Flexible routing

Pro users can bring their own SMTP infrastructure through AWS SES, Postmark, or private SMTP.

API key control

Create keys for your applications. Pro adds unlimited keys and domain isolation.

Uncapped daily sending

Your plan is governed by its monthly allowance rather than an arbitrary daily send ceiling.

Support that scales

Developer users get community and documentation support, while Pro includes priority technical support.

From setup to delivery in four steps.

A straightforward workflow for getting application email into production.

Connect your domain

Set up a verified sending domain so your application can send from an address on your own domain.

Create an API key

Give your application the credentials it needs to authenticate with the AuthyEngine delivery API.

Build your email

Prepare your sender, recipient, subject, and message content using the delivery request your application needs.

Send through the API

Submit your email request and receive a delivery identifier with a queued status from the service.

Designed for developers

Keep email infrastructure out of your application's core logic and work with a focused delivery layer.

  • Simple API-oriented integration
  • Verified sending domains
  • Application-specific API keys
  • Transactional email workflow

Ready for growing apps

Move beyond an MVP when you need more domains, more keys, priority support, and SMTP flexibility.

  • 50,000 emails / month on Pro
  • Unlimited API keys with domain isolation
  • Priority Queue & Technical Support
  • Bring your own SMTP infrastructure

Email that fits the way your app works.

Send the messages your customers need, without building your own email delivery layer.

Welcome emails

Send a polished welcome message when someone joins your product or starts using your service.

Order confirmations

Keep customers informed with timely order confirmations and transaction updates.

Receipts & invoices

Deliver receipts, invoices, and other purchase-related documents directly to customers.

Product notifications

Send important product updates, activity notices, and other event-driven notifications.

Contact forms

Route contact form submissions and website inquiries to the inboxes that need to receive them.

Other transactional email

Handle the application-generated emails that keep your customers informed throughout their journey.

Security & control, built into your delivery layer.

Keep your email infrastructure organized with controlled access, verified sending domains, and flexible routing.

API key control

Use dedicated API credentials to control which applications can access the email delivery API.

Verified sending domains

Keep sending tied to domains you have configured and verified for your application.

Domain isolation

Pro gives you domain isolation so production sending can stay organized across multiple domains.

Flexible SMTP routing

Use your own SMTP infrastructure on Pro when your delivery setup requires a provider you control.

Simple, transparent pricing.

Start at $0 and move to production when your application needs more capacity and flexibility.

Developer

Ideal for side projects, MVPs, and early-stage applications.
$0 / month
Start for free
  • 5,000 emails / month
  • 1 verified domain
  • 1 API key
  • Community & Documentation support
  • No external SMTP routing
GROWTH

Pro / Growth

Production-scale sending with infrastructure flexibility for growing apps.
$29 / year
Choose Pro
  • 50,000 emails / month
  • 10 verified domains
  • Unlimited API keys + domain isolation
  • Priority Queue & Technical Support
  • Bring your own SMTP infrastructure

Frequently asked questions.

Learn how AuthyEngine's delivery, domains, API keys, routing, support, and plans work together.

What is AuthyEngine?

AuthyEngine provides an application email delivery layer with an API, verified sending domains, API key management, and flexible SMTP routing.

How does API-first delivery work?

Your application sends an email request to the AuthyEngine API with the sender, recipient, subject, and message content. The API returns a message identifier and queued status so your application can continue its workflow.

Can I send emails from my own domain?

Yes. You can connect and verify a sending domain, then use that domain for application email.

What are verified domains used for?

Verified domains keep your sending configuration organized and let you control which domains are configured for application email.

How do API keys work?

API keys provide credentials for applications connecting to AuthyEngine. The Developer plan includes one API key, while Pro includes unlimited API keys with domain isolation.

What is flexible SMTP routing?

Pro lets you bring your own SMTP infrastructure when you want to use a delivery setup you control, including AWS SES, Postmark, or custom private SMTP.

What can I send with AuthyEngine?

AuthyEngine is designed for transactional application email such as welcome emails, order confirmations, receipts and invoices, product notifications, contact form emails, and other application-generated messages.

Does AuthyEngine support contact form emails?

Yes. Contact form submissions can be sent through the same application email delivery workflow.

What is included in the Developer plan?

The Developer plan includes 5,000 emails per month, one verified domain, one API key, and community and documentation support.

What does Pro add?

Pro includes 50,000 emails per month, 10 verified domains, unlimited API keys with domain isolation, priority queue and technical support, and the ability to bring your own SMTP infrastructure.

Can I start for free?

Yes. The Developer plan is free and includes 5,000 emails per month for getting started.

How do I choose between Developer and Pro?

Developer is suited to side projects, MVPs, and early-stage applications. Pro is intended for production-scale sending when you need more capacity, domains, API keys, support, and SMTP flexibility.