sentio gives every agent a real email address, with a full multi-tenant Rust mail server behind it
GitHub·medium signal
truespar/sentio, created 2026-08-23 and at 190 stars, is an inbound and outbound mail server written in Rust that hands each agent its own address, delivers received mail as structured webhooks, and replies in-thread over REST. It implements DKIM, SPF, DMARC and ARC, plus MTA-STS, DANE and a three-tier anti-spam stack, so it is a real MTA rather than a wrapper over a mail API. This is the inverse of the usual pattern where agents read a human's inbox through OAuth.