Sentio
Sentio, from Truespar, is a self-hosted email inbox API for AI agents: a Rust SMTP server that gives each agent a real address, delivers inbound mail as authenticated webhooks and lets agents reply in-thread over REST, with multi-tenant isolation.
Updated
✨ Try AgentScout's free AI image generator →Good for: automating workflows, writing and managing email, connecting tools with MCP
Official channels
Use cases
About Sentio
Sentio is listed in our MCP & infra category and is aimed at builders. Sentio, from Truespar, is a self-hosted email inbox API for AI agents: a Rust SMTP server that gives each agent a real address, delivers inbound mail as authenticated webhooks and lets agents reply in-thread over REST, with multi-tenant isolation. Pricing, as the maker states it: Free and open source (MIT or Apache-2.0), self-hosted. Maturity: Active. We last checked the official link on 2026-10-20.
Sentio at a glance
- Category: MCP & infra
- Built for: Developers and teams building with AI agents
- Pricing: Free and open source (MIT or Apache-2.0), self-hosted (as the maker states it)
- GitHub: truespar/sentio · 255 stars (as of Oct 20, 2026)
- Official site: truespar.com/sentio
- Listed on AgentScout: Oct 20, 2026
Sentio FAQ
What is Sentio?
Sentio, from Truespar, is a self-hosted email inbox API for AI agents: a Rust SMTP server that gives each agent a real address, delivers inbound mail as authenticated webhooks and lets agents reply in-thread over REST, with multi-tenant isolation.
How much does Sentio cost?
Sentio's pricing, as the maker states it: Free and open source (MIT or Apache-2.0), self-hosted. Check the official site for current plans.
Where can I find Sentio's source code?
On GitHub at truespar/sentio, which had 255 stars as of Oct 20, 2026.
What are alternatives to Sentio?
Similar tools include Atomic Mail, Bird MCP, SendPulse MCP, MailVeri MCP, Xquik and RocketReach MCP.
Facts from our link-checked listing, the GitHub repository and the official site. See something wrong? Suggest an edit.
Sentio ratings and reviews
Sentio alternatives
Other MCP & infra tools in our directory. See all MCP & infra tools →
Atomic Mail
Email API that gives AI agents their own inboxes, built on JMAP with MCP and agent skill support.
Bird MCP
Bird's MCP server for sending and receiving email, SMS, WhatsApp and voice messages from AI agents through one API.
SendPulse MCP
SendPulse's MCP server for driving its email, CRM, chatbot, SMTP and course automation from AI agents.
MailVeri MCP
Open-source MCP server that lets AI agents and coding assistants verify single emails and bulk email lists through the MailVeri API, with SMTP, catch-all, disposable and role-account detection.
Xquik
Xquik is an X (Twitter) data service for searching and extracting tweets, replies, followers and profiles, monitoring accounts and posting, over REST, an OAuth MCP server and SDKs; pay-as-you-go from $10 or monthly plans from $20.
RocketReach MCP
RocketReach's MCP server for looking up verified work emails and phone numbers from its contact database.
Badge for makers
Built Sentio? Add this badge to your README or site. It links back to this page. About badges
