The email API for developers
and AI agents

Send and receive email via API or SMTP. Free tier to get started, and built for the age of AI.

Start Sending Read the Docs
99.9%
Uptime SLA
<2s
Median delivery
Free tier
No credit card
DKIM + SPF
Authentication built in

Send your first email in minutes

Use our REST API or SMTP relay. Drop in your API key and start sending — no complex configuration required.

API + SMTP

REST API for modern apps, SMTP for legacy systems. Same account, same dashboard.

Your domains

Send from your own domains with DKIM and SPF configured automatically.

AI agent ready

MCP server, Agent Skills, and machine-readable docs for AI-native workflows.

curl -X POST https://api.mailertogo.com/v1/send \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "from": "you@yourdomain.com",
    "to": "user@example.com",
    "subject": "Hello from Mailer To Go",
    "html": "<p>You are up and running.</p>"
  }'

Why developers choose Mailer To Go

Built for developers

Clean REST API, SMTP relay, webhooks, and full management API. No bloated dashboards or marketing features you don't need.

Your domains, your reputation

Send from your own domains with DKIM, SPF, and DMARC authentication configured automatically.

Secure and compliant

SSL/TLS encryption, data encrypted at rest. GDPR compliant. Your data stays yours.

Zero to sending in seconds

Provision and start sending immediately. No server management, no infrastructure to maintain. We handle everything.

Scales with you

From 10,000 emails free to unlimited on Enterprise. Distributed, fault-tolerant infrastructure that grows as you do.

Real support from real people

Chat support on every plan. No ticket queues, no waiting days for a response.

Security and protection

We use SSL/TLS encryption on all our websites and microservices satisfying the highest security and data protection standards.
The data you store on Mailer To Go is encrypted in transit and at rest on the server side.
Our mailing infrastructure is hosted on DigitalOcean's SOC 2 Type II certified data centers.
Firewalls restrict access to our network from external networks and between systems internally.
Backend access is limited to Mailer To Go staff and requires key authentication and multi-factor authentication.

Security

We understand the sensitivity of your data and we take all the necessary steps to safeguard it. Keeping our services secure is fundamental to the nature of our business. That's why security is our number one priority.

Learn more about security

"We use Mailer To Go to send transactional emails. And we love it."

John Cross
Doorkeeper

Works with your stack

Heroku Build.io Rails Django Node.js Laravel Any SMTP client

Ready to get started?

Be up and running with sending emails in seconds.

Start Sending
GDPR Ready