Question : How Does the Mailpro API Work?

Mailpro’s API lets developers send transactional and marketing emails directly from their software, without going through the web interface. Access requires login credentials and an API key, and every API call must follow our API Use Policy — an integral part of our Terms.

How API access works

• Credentials: your Mailpro account credentials plus an API key issued by support
• Endpoint: documented REST endpoints, all under HTTPS
• Authentication: API key in the request header — never in the URL or in shared logs
• Rate limits: we monitor usage to keep service quality stable for all customers

Acceptable use rules — same as the rest of Mailpro

API traffic is bound by the same acceptable-use rules as the web interface. You may not use the API to send spam, route purchased lists, target unauthorized industries, or attempt to bypass our content filters. We reserve the right to monitor API calls to verify compliance.

Confidentiality and privacy

If you share end-user data through our API, you must protect that data and publish a privacy policy in your integration that clearly explains what is collected, how it is used, and for what purpose. Our own commitments are in our data security page and the broader privacy policy.

Rate limits, fair use, and dedicated API

To preserve service quality for everyone, we may restrict or block clients whose API calls overload our servers. If you have specific volume requirements not supported by the standard API, contact support — we can offer a dedicated API plan tailored to your traffic.

Credits and reliability

API calls consume the same credits as web sends. Pair API integrations with automatic top-up so high-volume traffic never stops for lack of credits, and check the payment-declined guide for handling card failures. Subscription credits roll over while the subscription is active.

Updates and breaking changes

We reserve the right to modify or update the API and this policy at any time. Changes are communicated by email and on our website, and may impact how your integration behaves. Subscribe to our developer notifications to stay current.

Disclaimer

API integration is at your own risk, in accordance with our API documentation. Using the API does not constitute or imply a partnership or joint-venture relationship with Mailpro. For technical questions, contact our support team. To choose between API and SMTP for your use case, read the differences between SMTP and API.