Works with the AI tools you already use
Claude Code
Cursor
Codex CLI
Muse
OpenClaw+21 moreClaude CodeCursorCodex CLIMuseOpenClaw
Manus
Grok
Grok Bot+18 agentsTesting With Sandbox
Safely capture and inspect test emails in a staging environment without sending to real recipients.
Free
testing-with-sandbox
Example session with this skill installed
Show me how to configure my Node.js app to send test emails to my Mailtrap sandbox inbox #123456.
- Read your context and instructions
- Compiled the testing-with-sandbox
Install the mailtrap package, then use the following config:
const { MailtrapClient } = require("mailtrap");
const client = new MailtrapClient({
token: process.env.MAILTRAP_SANDBOX_TOKEN,
testInboxId: 123456,
});
Note: Ensure you use the Sandbox-specific API token.
Connects securely to your tools. The creator never sees your data.
About this skill
Teaches agents to route outbound mail into a Mailtrap Email Sandbox (test inbox) so nothing reaches real recipients during development, staging, or CI. Covers both the HTTP Testing API (sandbox.api.mailtrap.io) and SMTP approach, how to obtain and use inbox_id, the separate sandbox token scope, and how to read and assert on captured messages via the Sandbox API. Includes SDK guidance and a common-mistakes table.
How to install
Works the same in every agent - Claude, Cursor, Codex, Copilot and 20+ more.
- 1
Download the ZIP
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- 2
Unzip into your skills folder
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- 3
Ask your agent to use it
Restart the agent if it was already running. It picks the skill up automatically - no config needed.
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Click the path to copy it. Create the folder if it does not exist yet.
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Mailtrap
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