What is Mailto.Bot?
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.
What is Mailto.Bot 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.
How much does Mailto.Bot cost?
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 and 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 about Mailto.Bot
What is Mailto.Bot used for?
Mailto.Bot is used to create and manage email mailboxes programmatically via API, primarily for developers and AI agents that need to send and receive email without manual setup. Common use cases include AI agent workflows that require email communication, automated transactional email systems, and testing pipelines that need disposable email addresses. The service is designed for programmatic access rather than human inbox management.
Is Mailto.Bot free?
Yes, Mailto.Bot offers a permanent free tier that includes 3 mailboxes, 3 seats, and 1,000 messages per month with full REST API and MCP access. The paid Pro plan starts at $5 per seat per month and adds 10 mailboxes per seat, 10,000 messages per seat per month, real-time webhooks, and priority support. No credit card is required to start on the free tier.
How does Mailto.Bot work?
Mailto.Bot works by exposing a REST API where a single POST request to /api/mailboxes returns a working email address in under 60 seconds, with no DNS configuration or domain verification needed. Developers can then send email via API, query received messages, or subscribe to webhooks for real-time delivery notifications. AI agents can connect natively via the MCP server URL, which provides 9 built-in tools for managing mailboxes and messages.
How does Mailto.Bot compare to SendGrid or Mailgun?
Unlike SendGrid and Mailgun, which require manual domain setup and take 30 or more minutes to reach the first email, Mailto.Bot creates a mailbox in one API call and is ready in under 60 seconds. Mailto.Bot also supports receiving email natively without complex inbound parsing routes, and it is the only provider in the comparison with first-class MCP support for AI agents. The trade-off is that outbound sending is scoped to within-organization mailboxes rather than arbitrary external recipients.
Does Mailto.Bot support AI agents?
Yes, Mailto.Bot provides a dedicated MCP (Model Context Protocol) server that any compatible AI agent — including Claude Desktop — can connect to via a single URL. Once connected, the agent gains 9 native tools covering mailbox creation, message sending and reading, deletion, and webhook management, with no additional glue code required. The product was itself designed, built, and tested using AI agents.
Reviews
Sign in to rate and review Mailto.Bot.
Sign in to reviewNo reviews yet. Be the first to review Mailto.Bot!