Overview / Description
Mailto.Bot is an AI email API for developers and AI agents that creates fully functional mailboxes with a single API call. It handles both sending and receiving email programmatically, making it suited for developers building automated workflows and AI agents that need native email capabilities.
The service was designed specifically for programmatic workflows rather than human inboxes or marketing use cases. A single POST request to the API returns a working email address with no DNS configuration, no domain verification, and no waiting — the company states the time from zero to first email is under 60 seconds. Incoming messages are stored and queryable, and developers can choose between polling or real-time webhook notifications for new mail. Messages auto-expire by design, making Mailto.Bot suited for transactional and agent-driven workflows rather than persistent storage.
Mailto.Bot's standout capability is first-class Model Context Protocol (MCP) support. Connecting a compatible AI agent — such as Claude Desktop — via a single URL gives it access to 9 native tools: create, list, and delete mailboxes; send, read, and delete messages; plus webhook management. The REST API includes pre-filled code snippets in 6 programming languages. As an additional abuse-protection measure, outbound email from agent mailboxes is scoped to other Mailto.Bot mailboxes within the same organization, so a leaked API key cannot be used to send external spam. This positions Mailto.Bot as a practical AI agent email API for teams that need contained, auditable email automation without the configuration overhead of traditional providers.
Used For
Mailto.Bot is used to provision and manage email mailboxes programmatically for developer automation pipelines and AI agents that need to send and receive email via API. It is particularly suited for autonomous AI agent workflows that require a contained email channel without manual domain configuration.
Pricing
Free
3 mailboxes, 3 seats, 1,000 messages per month, 60 requests per minute, REST API and MCP access. No time limit.
Pro
$5 per seat per month. 10 mailboxes per seat, unlimited seats, 10,000 messages per seat per month, 300 requests per minute, REST API, MCP, webhooks, and priority support.
Pros & Cons
Pros
- Creates a working email address in one POST request — no DNS setup or domain verification required
- Native MCP integration exposes 9 email tools to any MCP-compatible AI agent via a single connection URL
- Real-time webhook notifications deliver full JSON payloads on incoming mail with zero polling required
- Messages auto-expire by design, keeping storage clean for transactional and agent workflow use cases
- Free tier includes 3 mailboxes and 1,000 messages per month with full REST API and MCP access
Cons
- Outbound email is restricted to mailboxes within the same organization — cannot send to arbitrary external addresses
- No permanent message storage; ephemeral design makes it unsuitable for inbox or archive use cases
- Free tier capped at 3 mailboxes and 1,000 messages per month, which may be limiting for larger agent deployments
- No native mobile app or GUI inbox — interaction is entirely API or dashboard-based
Questions & Answers
Alternatives
SendGrid, Mailgun, Resend, Postmark