Smith vs AgentMail: an inbox API or a whole coworker
· Avi Agola, The Seattle Compute Company
AgentMail and Smith both give an AI agent its own email address, but they sit at different layers. AgentMail sells the inbox. Smith sells the coworker that has an inbox among other things.
What we say about AgentMail comes from its home page and pricing page, as read on 2026-10-29.
The short version
AgentMail describes itself as "the email inbox API for AI agents." You build an agent, and AgentMail gives it a mailbox that you control through code. Everything else the agent needs, such as a model, a way to browse, accounts on other sites and logging, you bring.
Smith is the whole thing. The agent already has its own email address, its own Slack handle, its own computer with a browser, accounts, and a record of every action. You hire it and give it a job.
Side by side
| Criterion | Smith | AgentMail |
|---|---|---|
| Built for | Teams | Developers and platform builders giving their own agents inboxes; it also lists multi-tenant pods for platforms[1] |
| Whose identity the agent uses | Delegated or agent-owned accounts, audited | Each agent gets its own inbox and email address. Which accounts sit behind it isn't stated[1] |
| Where you talk to it | Slack handle + email | REST API, Python and TypeScript SDKs, MCP server, IMAP/SMTP, webhooks and a console[1] |
| Has its own computer/browser | Own VM + browser per agent | Not stated[1] |
| Audit trail of actions | Every action traced to the agent | Not stated[1] |
| Models (BYOM?) | Any provider (BYOM) | Not stated[1] |
| Runs on your compute (BYOC?) | Yes (BYOC) | The enterprise tier lists bring-your-own-cloud deployment[2] |
| Pricing model | Free to start; custom plans for teams | Tiers by inboxes and email volume: free, $20/month, $200/month, then enterprise[2] |
Competitor cells come from each product's own pages, as of 2026-10-29. Smith's column is how Smith works today. "Not stated" means the page we read doesn't say.
- AgentMail home page (accessed 2026-10-29)
- AgentMail pricing (accessed 2026-10-29)
When AgentMail is the right pick
AgentMail is the better choice when:
- You're a developer building your own agent and the only piece you're missing is email. An inbox API is exactly the right size for that.
- You need many inboxes programmatically. It lists custom domains, multi-tenant pods for platform builders, and SDKs and webhooks for wiring inboxes into a product.
- You want to start with a free tier. It lists a free plan with three inboxes.
If you already have an agent and just need it to send and receive mail, you don't need a whole coworker, and Smith would be more than you need.
When Smith is the right pick
Smith is the better choice when you don't want to build the agent yourself. You want a coworker who is already set up:
- It works in Slack and email, so your team talks to it where it already talks.
- It has its own computer and browser, so it can sign in and do work on sites that have no API.
- It uses delegated or agent-owned accounts, with every action traced to the agent that took it. See delegated vs agent-owned identity.
- It's free to start, with custom plans for teams rather than priced by inbox. See pricing.
How to decide
Three questions get you most of the way:
- Are you building the agent, or do you want one? Building points to AgentMail. Wanting one points to Smith.
- Is email the only thing missing? If you already have the model, the browser and the logging, add an inbox API. If you have none of those, you'd be assembling them.
- Who will use it? An API suits a developer wiring things together. Slack and email suit a team handing off work.
The two can also coexist. If you've built your own agent on AgentMail for a specific job, that's no reason not to hire a Smith agent for the work behind logins.
For how Smith handles the email side specifically, read giving an AI agent its own Slack handle and email inbox.
Email acme@agents.seattlecompute.com and an agent writes back.