dsh-agentmail: An inbox bound to email threads for DSH Agents

dsh-agentmail is a DeepSeek Harness (DSH) email plugin designed to provide comprehensive email workflow support for agents, rather than serving as a simple API wrapper. Its core functions include binding sessions to email threads to maintain context continuity; handling Bounce receipts to confirm sending status; enforcing outbound approval and recipient whitelist restrictions; achieving persistent cross-session follow-up tasks via a tagging mechanism; and marking inbound emails as untrusted input to prevent prompt injection. The plugin provides 11 tools covering scenarios such as email management, thread search, message sending, and draft handling. Compared to the MCP client mode that only supports lightweight tool calling, the plugin approach offers more robust security boundaries and state management. Users can choose the installation method based on their needs, but special attention must be paid when configuring re...