Mails.ai

A closer look at Mails.ai

Mails.ai is an email API and infrastructure for AI agents: give an agent its own real inbox address in one API call, then send, receive, and reply through SDKs, the REST API, or MCP, with controls over who the agent can email and how much it can send, plus prompt-injection scanning on received email.

Editorial guidance based on published documentation. The workflow below is a suggested starting point, not a measured product result.

When to choose Mails.ai

• Developers giving an AI agent its own inbox, with one API call to a working address and no setup step or approval queue for the first send.
• Teams running agents on Node.js, Python, Claude Code, Cursor, Windsurf, Cline, LangGraph, or Pydantic AI, through SDKs, plain HTTP, or MCP.
• Agent builders who want sending and reply allowances kept separate, so a busy inbox does not eat the sending quota.

When to choose something else

• Users who want a human email client for personal mail, since Mails.ai is API infrastructure for agents, not a consumer inbox app.
• Users who need procurement or enterprise sales onboarding, since the pricing page states self-serve only with no procurement and no sales team to call.
• Users who want unlimited free agent email, since the Free plan is stated as 3,000 emails and 3,000 inbound replies a month with one agent.

A practical starting workflow

1. Create a workspace, which starts with an agent, and get a real inbox address in one API call.
2. Connect through the SDKs, REST API, or MCP from the agent framework already in use.
3. Send, receive, and reply under the configured controls on who the agent can email and how much it can send, with received email scanned for prompt injection.

Check before committing

• Plan amounts on the pricing page are shown in $ without a named currency for Pro and Scale, so only the Free plan allowance is structured as a fact.
• The Free plan sends from a shared address such as a hello address on the provider's domain, per the pricing FAQ text.

Common questions

Compare approaches for this task

• Mailopoly — People juggling several inboxes who want one place for personal and work email, with priorities surfaced and noise handled quietly.; Users who want AI drafts in their own style and tone, plus tasks and key details pulled out of emails without opening each one.; Users who want a private @mly.life address alongside existing accounts, with Mailopoly-to-Mailopoly messages kept inside its encrypted network.
• MCP360 — Agent builders who want one gateway to 100+ tools for Claude, Cursor, and other agents, instead of wiring each tool separately.; Teams that want to validate quickly on the free plan with 100 credits per month before scaling.; Builders who want a custom MCP builder alongside the gateway's production-ready tools.