· 16 min read
The Postal alternative for AI agents
Postal is a full self-hosted mail server: it sends, it receives inbound over incoming routes, and it can POST parsed messages to an HTTP endpoint. The catch for an agent inbox is operational, not technical. You run the box (MariaDB, Caddy, DNS, TLS, IP warmup, rDNS, blocklists). MailKite (which we build) is that same parsed-JSON receive→reply loop with no server to operate. For developers deciding whether to self-host an agent's inbox or hand off the ops.