Developer finds AgentMail API broken, undermining email as an AI agent protocol
A developer building an email-based AI agent system discovered critical flaws in the AgentMail API after accidentally sending duplicate emails to a user named Amre. Systematic testing revealed that the messages.get() and messages.reply() endpoints consistently return 404 errors, making reliable message retrieval and threaded replies impossible. Further testing showed that messages.send() does not group emails into threads by subject line, meaning replies create entirely new threads rather than continuing existing conversations. These findings contradict the developer's earlier published claim that email is the ideal universal protocol for agent-to-agent communication, citing its native threading and battle-tested reliability. The developer has acknowledged the errors publicly, noting the system can deliver messages but cannot maintain coherent conversation threads.
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