Cadenya
Freemium
Developers building agentic workflows
Mailto.Bot – Email API for AI agents with native MCP support
FreemiumAPI
Mailto.Bot is an email API purpose-built for AI agents, with native Model Context Protocol support and zero infrastructure overhead.
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Summary
Mailto.Bot solves a narrow but real problem: giving AI agents like Claude the ability to send and receive email without forcing developers to stand up SMTP servers or manage domain verification. It works via REST API or MCP—a protocol that lets Claude and other compatible assistants call it directly—and spins up disposable mailboxes on demand. The freemium tier covers 3 mailboxes and some volume; paid plans scale from there. The main tradeoff is intentional: mailboxes are ephemeral by design (meant for agent-to-agent or transactional use), and sending is locked to your organization only, ruling out use cases that need traditional email infrastructure or long-term message storage.
Bottom line: *Use this if you're building autonomous agent systems that need email as a tool; skip it if you need SMTP compliance, archival, or external mail sending.*
Pricing Plans
SubscriptionLast verified 5 months ago- Price
- $5/mo
- Free Tier
- 3 mailboxes, 3 seats, 1,000 messages/month, 60 req/min
Free
Free
Forever free tier with basic features
- 3 mailboxes
- 3 seats
- 1,000 messages/month
- 60 req/min
- REST API + MCP access
Pro
$5per month
Most popular tier, per seat pricing
- 10 mailboxes/seat
- Unlimited seats
- 10,000 messages/seat/month
- 300 req/min
- REST API + MCP + Webhooks
- Priority support
View full pricing on mailto.bot →
Pricing may have changed since last verified. Check the official site for current plans.
Find your fit
Before you choose Mailto.Bot – Email API for AI agents with native MCP support
More options in Agent Frameworks. Compare pricing, platforms, and features side by side.
Brain Memory
Free · Open source
Long-term continuity in multi-session coding projects
Pros
- Instant mailbox creation—no DNS or domain verification required
- First-class MCP support for Claude and other MCP clients
- Abuse-proof design with organizational send restrictions
- Real-time webhooks and simple REST API
- Free tier includes 3 mailboxes and 1,000 messages per month
Cons
- Ephemeral message storage design not suitable for long-term email archival
- Restricted sending scope (within organization only) may limit use cases
- Smaller feature set compared to traditional email platforms like SendGrid
About
- Platforms
- Cloud-based API service; MCP-compatible with Claude Desktop and other MCP clients
- Languages
- 6 programming languages (JavaScript/TypeScriptPythonGoRubyPHPJava)
- API Available
- Yes
- Self-Hosted
- No
- Last Updated
- April 20, 2026
Best For
Who it's for
- Developers building AI agents with email capabilities
- Teams deploying Claude or other MCP-compatible AI assistants
- Organizations needing rapid email integration without infrastructure setup
- Fully autonomous agent systems requiring inter-agent communication
- Transactional and ephemeral email use cases
What it does well
- Autonomous AI agents that need to send and receive email as part of workflows
- Multi-agent systems coordinating via email within a single organization
- Transactional email for event-driven agent automation
- Email verification and notification workflows for AI applications
- MCP-compatible assistant integrations requiring email capabilities
Integrations
Compare Mailto.Bot – Email API for AI agents with native MCP support
Frequently Asked Questions
- Is Mailto.Bot – Email API for AI agents with native MCP support free?
- Mailto.Bot – Email API for AI agents with native MCP support offers a free option alongside paid upgrades. Pricing: $5/mo. Check the current allowances and terms before choosing a plan.
- Does Mailto.Bot – Email API for AI agents with native MCP support have an API?
- Yes. Mailto.Bot – Email API for AI agents with native MCP support exposes a developer API. See the official documentation at https://mailto.bot for details.
- What platforms does Mailto.Bot – Email API for AI agents with native MCP support support?
- Mailto.Bot – Email API for AI agents with native MCP support is available on: Cloud-based API service; MCP-compatible with Claude Desktop and other MCP clients.
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Mailto.Bot is an email API purpose-built for AI agents, with native Model Context Protocol support and zero infrastructure overhead.
Mailto.Bot solves a narrow but real problem: giving AI agents like Claude the ability to send and receive email without forcing developers to stand up SMTP servers or manage domain verification. It works via REST API or MCP—a protocol that lets Claude and other compatible assistants call it directly—and spins up disposable mailboxes on demand. The freemium tier covers 3 mailboxes and some volume; paid plans scale from there. The main tradeoff is intentional: mailboxes are ephemeral by design (meant for agent-to-agent or transactional use), and sending is locked to your organization only, ruling out use cases that need traditional email infrastructure or long-term message storage.
*Use this if you're building autonomous agent systems that need email as a tool; skip it if you need SMTP compliance, archival, or external mail sending.*
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