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Mails.ai
What it is
Mails.ai provides email infrastructure and a programmatic email API for AI agents handling transactional and conversational email. Agents can send messages, receive replies, and parse incoming mail. Replies arrive in structured payloads with sender, subject, body, headers, attachments, an injection score, and sender reputation. Inbound messages are scanned for prompt injection on every plan. Optional classification can extract intent, entities, and urgency for $0.003 per inbound. Developers can use REST, webhooks, an MCP server, and TypeScript or Python SDKs, with integrations listed for tools and frameworks including Claude Code, Cursor, OpenAI Agents SDK, LangGraph, and Pydantic AI. Mails.ai is available on the web and via API; its maker describes the product as early, live, and self-serve. The API refuses cold outreach. Plans are Free at no cost, Pro at $20/mo, and Scale at $99/mo. Monthly caps apply: sends stop at the cap, and inbound replies over the cap are stored but not scanned or sent to the webhook.
For and against
For
- Prompt-injection scanning is included on every plan.
- Inbound replies include structured message details and reputation signals.
- REST, webhooks, MCP, and TypeScript and Python SDKs.
- Free plan includes 3,000 events per month.
- Integrations include several agent frameworks and coding tools.
Against
- Cold outreach is refused at the API.
- Inbound classification costs $0.003 per inbound.
- Inbound over-cap replies are not scanned or sent to webhooks.
- Dedicated IP is an on-request roadmap add-on; beta uses shared pool.
The verdict
Mails.ai is aimed at programmatic transactional and conversational email, with structured replies and several developer interfaces. Check plan caps and the limits on over-cap inbound handling before relying on it for automated workflows.
Who it suits
It suits developers building AI agents that need transactional or conversational email and structured inbound replies. It is not for cold outreach through its API.
Plans and prices
Free
3,000 events / month · 1 agent · TypeScript + Python SDKs, REST · MCP server
Read 8 Oct 2026 · mails.ai
Pro
5 agents · 50K sends / month · 50K inbound replies / month · custom domain
Read 8 Oct 2026 · mails.ai
Scale
Unlimited agents · 250K sends / month · 500K inbound replies / month · per-agent allowlists + budgets
Read 8 Oct 2026 · mails.ai
On the record
- API and tools
- The product offers REST, webhooks, an MCP server, and TypeScript and Python SDKs.mails.ai · read 8 Oct 2026
- Billing caps
- The pricing page says sends stop at the plan's monthly cap, while inbound replies over the cap are stored but not scanned or sent to the webhook.mails.ai · read 8 Oct 2026
- Classification
- Inbound classification can extract intent, entities, and urgency; the features page lists it as opt-in for $0.003 per inbound.mails.ai · read 8 Oct 2026
- Compliance
- The maker says it has a GDPR-aligned baseline, does not have SOC 2 today, and does not include HIPAA in Phase 1 scope.mails.ai · read 8 Oct 2026
- Dedicated IP
- The features page lists a dedicated IP at $50 per month per IP on Scale+ as an on-request roadmap add-on, and says current beta sending uses the shared pool.mails.ai · read 8 Oct 2026
- Inbound replies
- Inbound replies are delivered as structured payloads containing sender, subject, body, headers, and attachments, with injection score and sender reputation included.mails.ai · read 8 Oct 2026
- Integrations
- The integrations page lists Claude Code, Cursor, Cline, Continue, Windsurf, OpenAI Agents SDK, Anthropic SDK, LangGraph, Mastra, Vercel AI SDK, and Pydantic AI.mails.ai · read 8 Oct 2026
- Platform maturity
- The maker describes the product as early and says the API is live and self-serve.mails.ai · read 8 Oct 2026
- Product
- Mails.ai provides email infrastructure and a programmatic email API for AI agents to send, receive, and parse email.mails.ai · read 8 Oct 2026
- Security scanning
- The service scans inbound messages for prompt injection on every plan.mails.ai · read 8 Oct 2026
- Support
- The pricing page includes email support on Pro and priority support on Scale.mails.ai · read 8 Oct 2026
- Transport and storage security
- The trust page says public surfaces use TLS 1.3, the primary database is encrypted at the infrastructure layer, and AWS SES message storage uses AWS-managed KMS encryption.mails.ai · read 8 Oct 2026
- Use case limits
- Mails.ai is for transactional and conversational email and refuses cold outreach at the API.mails.ai · read 8 Oct 2026
