Standard filters miss the nuance of "middle-ground" emails, and existing AI email clients demand full inbox control or try to automate too much.

What I’m looking for:

- Strictly read‑only triage: Categorizes incoming mail (e.g., “important”, “maybe useful”, “likely promo”) with zero write permissions ie. no sending, moving, deleting, or auto-archiving

- Knowledge retrieval: Builds a searchable knowledge base from scattered threads. I want to ask natural-language questions like: “What were all the decisions about Project X across the last 3 months?”

- Follow-up & action item detection: surfaces email threads that have stalled and need a nudge, while extracting explicit tasks and deadlines buried in long chains

- (optional) Privacy-first: Ideally runs locally or lets me plug in my own API keys to keep the data secure

Has anyone seen a tool that focuses entirely on this read-only, triage + retrieval workflow?