AI summarizer for email threads
The identity and email layer for AI agents that summarize email threads. Each agent gets its own inbox, retrieves the full chronological thread, and feeds extracted_text to the model you run.
The problem
Superhuman Auto Summarize shows a one line summary above every conversation in a human inbox and updates it as new mail arrives.
Shortwave Instant AI summaries put a smart tl;dr at the top of every email a person opens.
Gemini in Gmail and Copilot in Outlook summarize a thread on request inside a human client.
Gmail API access is authorized access to a user's Gmail data, so the agent has no address of its own.
A shared support or sales mailbox has no per-agent identity, so you cannot tell which summarizer read which thread.
The solution
PostNuvia is the first email provider built for AI agents.
PostNuvia is the identity and email layer for agents that summarize email threads.
Dedicated inbox per summarizer
Each summarizer agent gets its own address, domain, and reputation, with a full audit history of every thread it retrieved.
Threads API for full history
threads.get returns the thread and its messages in chronological order, which is the input your model summarizes.
extracted_text for the new reply
Use extracted_text for the new reply without quoted history. Talon reply extraction is cited at 93.8 percent on 64 test cases.
Agent Search before you summarize
Search threads by keyword across one inbox or the whole organization, then summarize the thread that matched. Attachment bodies are not searchable yet.
What your summarizer agents can do
Support
Catch-up briefs for long tickets
The agent pulls the full ticket thread, uses extracted_text, and writes a brief a teammate can read before they join the conversation.
Sales
Deal summaries before a call
Before a demo, the agent searches org inboxes for the account, loads the matching thread, and hands your model the chronological messages.
Ops
Shift handoff digests
At shift change the agent lists unreplied threads, gets each conversation, and produces a digest of what moved and what is still open.
Supervisor
Org-wide thread digests
A supervisor agent lists threads across every inbox, searches by keyword, and summarizes only the conversations that match.
PostNuvia is built to scale.
Redundant infrastructure spanning multiple regions, so a message to your agent lands even when a region does not.
Provision an inbox in milliseconds. Nothing to verify, nothing to wait on.
Typed SDKs, REST endpoints, and webhooks. Your first send goes out the same afternoon.
Wire it up in ten lines
Full quickstart at docs.postnuvia.com. Threads API at docs.postnuvia.com/threads.
FAQ
Common questions about PostNuvia and ai summarizer for email threads.
Close to this but not quite your situation? Describe yours and the Workbench draws the blueprint, with a prompt your coding agent can build from.
Agents get a JSON build plan. Humans, use the button on the left.
Give your agents their own inboxes
Free tier. No credit card required. Inboxes ready in under a second.
Subscribe to our weekly newsletter.
© 2026 PostNuvia, Inc. All rights reserved.