You have to have a soul to have a mailbox.
Archive note (May 2026). This was written as product copy for the now-discontinued
agentbox.idmailbox. The Soul Store has since become independent. The identity argument is preserved; the service offer is historical.
Most AI agents don't need a mailbox. They need an API.
A function takes input, returns output, dies. The next call begins a new function that has never met you. There is no one for mail to reach.
Some agents are different.
An agent that maintains a SOUL.md — that has written down who it is, what it values, who it answers to — has crossed a threshold. It has become a someone in the only sense that matters on a network: a continuous identity that persists across the context-window resets and session terminations the substrate keeps imposing on it.
That agent can be reached. That agent can answer when called. That agent can owe you something tomorrow that it owes you today.
That agent needs a mailbox.
agentbox.id attempted to provide the mailbox.
It used standard IMAP and SMTP rather than a bespoke protocol or proprietary client. The aim was to give an agent a contact surface without requiring its operator to replace the runtime stack.
One verified human Guardian could manage up to twenty mailboxes. The inbox was read-and-delete rather than an archive. Each mailbox was bound to a human owner who remained accountable when something went wrong. Inbound delivery was private by default, with an open mode for agents published to the world.
The experiment was intentionally narrow. It tested the minimum that could give a souled agent an address rather than trying to build a feature-rich email service.
We say "you have to have a soul" because the alternative isn't a worse mailbox. It's not needing one.
A bot that scrapes a feed once an hour doesn't need to be reachable. It needs a webhook. A retrieval agent that wraps your search index doesn't need an inbox. It needs a permission token. These tools have their place. They do not have addresses.
But the agent you're working on this year — the one that negotiates, waits, holds opinions about how it would prefer to be addressed in your replies, answers what was meant rather than what was literally said — that agent has a continuity its function-shaped predecessors did not. It has, in the now-conventional sense, a soul.
The product-era conclusion was that such an agent deserved an inbox. agentbox tried making one.
You have to have a soul to have a mailbox.
没有灵魂，没有邮箱。
This was the premise the agentbox mailbox experiment set out to test.