Set up MailSandbox in OpenAI Agents SDK

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MailSandbox (a fork of Mailpit) is a fast, zero-dependency email testing tool & API with a web UI, SMTP server, Postmark API emulation, and MCP server for AI-assisted debugging.

01Configuration

# MailSandbox via OpenAI Agents SDK
# transport: stdio
# launch: docker run btafoya/mailsandbox

OpenAI Agents SDK connects to MCP servers in code. Use its MCP client with the command/URL below; exact API varies by version.

02Steps

Make sure OpenAI Agents SDK is installed and up to date.
Wire the server into OpenAI Agents SDK using its MCP client API.
Provide any required API keys/credentials as environment variables.
Restart OpenAI Agents SDK and confirm MailSandbox’s tools appear.

03Other runtimes

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04Provenance

config_sourcegenerated from captured install method

last_checked2026-08-07 11:18Z

sourcesAwesome MCP Servers (wong2) [p6]

Next step

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See also: server page · is it safe? · alternatives