Let’s explore how you can integrate PowerMTA with other systems using its HTTP-based APIs and webhooks. These features allow you to submit emails for delivery, receive event data, and enhance your email delivery capabilities.
PowerMTA Transmissions API
- The Transmissions API enables you to submit emails for delivery via HTTP. Instead of using an SMTP client library, you can create a JSON object and post it to a URL.
- Here’s how it works:
- Create an Email: Assemble your email content (headers, subject, text, HTML) and encode it according to the appropriate standards (e.g., MIME).
- Submit via API: Post the pre-built email JSON object to the Transmissions API endpoint.
- Note that PowerMTA expects the email to be already encoded for transmission, so you need to handle transfer encoding and MIME formatting.
PowerMTA Accounting Webhook
- The Accounting webhook allows you to push event data (e.g., bounces, complaints) to a web application.
- Key features:
- Event Data: Receive data related to email events (receptions, deferrals, deliveries, bounces, complaints).
- Batched Posts: Events are posted as newline-delimited JSON or CSV batches.
- Retries: If errors occur during posting, the webhook retries the batch.
- Similar to event webhooks provided by SMTP delivery service providers.
Configuration of HTTP APIs
- Setting up the HTTP APIs is straightforward and explained in the PowerMTA User’s Guide.
- If you need HTTPS, consider setting up a validating certificate from Let’s Encrypt for endpoints and CA certificates for webhooks.
By leveraging these APIs and webhooks, you can turn PowerMTA into your private SMTP delivery service, enhancing your email delivery infrastructure.
For more details, you can refer to the Postmastery article on HTTP-based APIs and webhooks in PowerMTA 5.0. Additionally, there’s an open-source PowerMTA Email API project on GitHub that demonstrates submitting emails to PowerMTA using HTTP and JSON.
