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Email & notification APIs

Mails.ai

Email infrastructure for AI agents

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DR by Ahrefs
29 no change since last check

Ahrefs Domain Rating benchmarked 14 Nov 2026, rebuilt 14 Nov 2026.

Self-serve API that gives AI agents their own email addresses with reply parsing, identity management, and reputation scoring built in.

What it is

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mails.ai, as visitors see it

Mails.ai is email infrastructure built for AI agents. Each agent gets its own email address and can send, receive, and parse replies programmatically. The API includes native prompt-injection scanning on every inbound message, per-agent reputation tracking, typed reply events without raw MIME parsing, and MCP-native distribution. Signup is self-serve with no sales calls or approval queue—sending works immediately. The service supports TypeScript and Python SDKs, REST API, and integrates with AI tools like Claude, Cursor, and LangGraph.

What it is built with

  • Per-agent email addresses on your domain
  • Native prompt-injection scanning on every inbound
  • Per-agent reputation graph
  • Typed reply events without raw MIME parsing
  • MCP-native distribution
  • Self-serve signup with no sales call
  • TypeScript and Python SDKs
  • HMAC-signed webhooks with retries
  • Per-agent allowlist and send limits
  • DKIM signing on custom domains

Pricing

Free: 3,000 emails + 3,000 inbound replies/month; Pro: $20/month for 50K emails + 50K inbound replies; Scale: $99/month for 250K emails + 500K inbound replies. Yearly billing available: Pro $200/year, Scale $990/year (two months free).

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Mails.ai metrics

Benchmarks for mails.ai: Ahrefs Domain Rating and Majestic link data, with the change since the last build.
MetricValue
Domain Rating29 no change since last check
Trust Flow8 no change since last check
Citation Flow36 no change since last check
Referring domains406 no change since last check
External backlinks7,187 no change since last check

Ahrefs Domain Rating benchmarked 14 Nov 2026, rebuilt 14 Nov 2026. Main build topic: Computers/Software/Shareware (8). Majestic benchmarked 14 Nov 2026, rebuilt 14 Nov 2026. Link data built by Majestic. Trust Flow, Citation Flow and Topical Trust Flow are trademarks of Majestic-12 Ltd.

Mails.ai domain build sheet

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Public RDAP record, last read 14 Nov 2026, 02:50 UTC.
Domain age4 years
Registered
Expires
RegistrarNameCheap, Inc.
DNSSECNot signed

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Questions from the bench

What is an AI mailer?
An AI mailer is software that uses artificial intelligence to handle email. For developers building autonomous AI agents, it means infrastructure that lets an agent conduct real email conversations without a human composing each message. The agent needs its own address, the ability to send programmatically, and a way to read replies without parsing raw MIME text. Mails.ai is built for agents that need to hold back-and-forth email conversations, not batch campaign senders.
Do I need a card to start?
No. The Free plan starts with a magic-link signup and no card: 3,000 emails and 3,000 inbound replies a month, and one agent. It sends from a shared address such as hello.yourcompany@send.mails.ai, with zero DNS setup.
What happens when I reach my monthly cap?
Sending stops at your plan's monthly cap until the next billing cycle or an upgrade. Inbound replies over the cap are still stored, but they are not scanned or sent to your webhook.
What stops a customer from abusing the API to send spam?
Open signup is not open sending. Every send is classified before it leaves, and cold outreach and bulk marketing are refused at the API. Free tier is hard-capped at 3,000 emails with email verification required. Per-tier hourly and daily send caps are enforced. A per-agent reputation classifier scores every send and suppression runs at send time. Anyone crossing a 0.3% complaint rate is auto-suspended.
What's the difference vs AgentMail?
AgentMail provides programmatic agent inboxes — the same primitive. The differences, checked October 2026: mails.ai scans every received email for prompt injection by default, on every plan, while AgentMail's screening (Agent Armor) is a beta you request, and it starts in observe-only mode. Each mails.ai agent can carry its own daily and hourly send limits, and Scale includes unlimited agents; AgentMail's $20 plan has 10 inboxes and its $200 plan has 150, with $2-a-month add-ons in between. Both are self-serve, and both have allow and block lists.

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