Improved SMTP Relay Logs

The Recent Activity Log now includes detailed sender and delivery information for outbound email. This empowers customers to diagnose sending issues.

Successful Email Log Entry

The screenshot below shows a successful email delivery sent from user2@mailsac.com to user1@mailsac.com. The email message id, number of delivery attempts, rejection status, and time stamps are included in the logs

Failed Email Log Entry

The screenshot below shows a failed email delivery from somebody@mailsac.com. The message id, number of attempts, timestamp, and error message are provided.

This error message indicates that the recipients domain no-where-no-where-no-where.info does not exist.

Industry Standard API Documentation

Mailsac API Documentation has been converted over to use OpenAPI.

Code Examples

The new format gives developers and quality assurance testers code samples for common programming languages (curl, Node, Python, PHP, Go, etc).

Explore the API Using Swagger UI

The API can be explored without writing any code using the Swagger UI Explorer. All that is needed to get started is a free Mailsac API Key (requires sign up).

In the Swagger UI Explorer, choose the Authorize button and enter your Mailsac API Key


Use the “Try it out” button to interact with any of the REST API endpoints. A curl example, request URL, response body, and headers are provided.