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MCP Events: own sends don't trigger message.received; WEV verification - #360
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Documents agentmail-api's relay change: mail an inbox sends itself no longer fires message.received (loop prevention), and callback verification also accepts a Standard Webhooks endpoint verification answer to the webhook-challenge header. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
josephfeleke
approved these changes
Nov 6, 2026
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Documents agentmail-to/agentmail-api#1964 on the MCP Events page:
message.receivedis not triggered by mail the inbox sends to itself, so an event-triggered task cannot loop on its own sends. To test a subscription, send from a different address. The troubleshooting entry says the same.webhook-challengeheader and accepts a Standard Webhooks endpoint verification answer (webhook-challenge-response) in place of the echo.Merge after agentmail-api#1964 is deployed to prod.
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