MailSandbox FAQs

Question 1

What is MailSandbox?

Accepted Answer

MailSandbox is a fast, lightweight, zero-dependency email testing tool and API designed for developers. It provides an SMTP server, POP3 server, modern web UI, REST API, Postmark API emulation, and an MCP server for AI-assisted debugging.

Question 2

How does MailSandbox enhance the email testing process?

Accepted Answer

It allows developers to capture and inspect emails sent by their applications locally, without relying on external services. Features like a modern web UI, HTML/source viewing, spam scoring, and attachment viewing streamline the debugging and testing of email functionalities.

Question 3

What are the unique features of MailSandbox compared to similar tools?

Accepted Answer

MailSandbox stands out with its drop-in Postmark API emulation, enabling seamless local testing of Postmark integrations. Additionally, its MCP server allows AI assistants to list, search, and analyze messages, offering advanced AI-powered debugging capabilities.

Question 4

Is MailSandbox easy to install and integrate into development workflows?

Accepted Answer

Yes, MailSandbox is designed for ease of use. It's available as a lightweight single static binary, a multi-arch Docker image, or via a simple install script for Linux/macOS. It integrates seamlessly with existing development environments, running locally with minimal setup.

Question 5

What kind of AI assistance does MailSandbox offer?

Accepted Answer

Through its MCP server, MailSandbox enables AI assistants (like Claude Code) to interact with your captured emails. This includes listing, searching, retrieving, and analyzing messages, facilitating more intelligent and efficient debugging processes.

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