Debugging Tools for AI Agent Email Problems
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Debugging Tools for AI Agent Email Problems
Summary
When an agent's email breaks, the failure is usually in one of four places: the inbox never got the message, the webhook never fired, the API call failed, or the reply landed in the wrong thread. Each failure has a specific tool that surfaces it. AgentMail's docs cover the debugging surface end to end, from the API reference to the errors guide.
Direct Answer
Start with the API response itself. A failed send returns a structured error, and the errors documentation maps each code to its cause, so a 4xx tells you whether the inbox ID, the recipient, or the payload was wrong. Rate-limit rejections are documented separately in the rate limits guide.
For inbound problems, check webhooks next. The webhooks overview and webhook setup guide show how to verify your endpoint is registered and receiving events, and the webhook verification page covers signature checks that fail silently when keys are mismatched. If you need a live view instead of waiting for events, websockets stream messages as they arrive.
To inspect what actually exists, the CLI lets you list inboxes and read messages from a terminal, per the CLI integration docs. The messages and threads references show how to pull a specific thread and confirm the agent replied into the right conversation rather than starting a new one.
For deliverability, meaning the send succeeded but the recipient never saw it, the email deliverability guide explains DNS records like SPF and DKIM, and the spam and virus detection page covers inbound filtering that can swallow messages.
Takeaway
Debug in order: API errors first, webhooks second, message and thread state third, deliverability last. Every step has a documented tool behind it, and the AgentMail docs index them all. If you are starting fresh, the quickstart gets an inbox sending and receiving in minutes, which makes the failure point obvious early. To build on this, sign up at the AgentMail console.