Mailsac

About Mailsac

Mailsac provides an API for handling disposable and testable email addresses, covering functions such as checking inbox messages, counting messages, validating email addresses, setting up forwarding, receiving messages via web sockets, and sending outbound mail. API keys authenticate requests and can be passed as a header, query string parameter, or JSON body field. All subscription tiers, including free accounts, can generate at least one API key.

By default, messages sent to Mailsac addresses are public and accessible to anyone unless a custom domain or private forwarding address is set up, which restricts visibility to the owner. Public inboxes do not require reservation before checking or counting mail, but are subject to throttling, and anyone can view or delete messages on them.

The API includes endpoints for listing, counting, and deleting inbox messages, with messages returned as parsed objects containing metadata such as sender, recipients, subject, headers, attachments, and links. Client libraries are available for Node.js and browser use, along with a Swagger UI for testing requests interactively. The service is aimed at developers, such as those needing disposable inboxes for QA testing or automated email verification workflows.

Key features

• Check, count, and list email messages for any inbox via REST API
• Public or private disposable email addresses, including custom domains and forwarding addresses
• API keys authenticated via HTTP header, query string, or JSON body
• Web socket support for receiving email messages in real time
• Outbound mail sending
• Node.js/browser client library (@mailsac/api)

Frequently asked questions