Mails
Mails.ai provides email infrastructure for AI agents: inbound emails are scanned for prompt-injection, scored for sender reputation, optionally classified into intent/entities, and delivered as structured events to agent code via SDKs and MCP.
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Best for: AI Agents
What it does
AI Agents software for decision-makers comparing workflow fit and alternatives.
Best fit
AI Agents
Pricing snapshot
Freemium from $0
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Mails
Mails.ai is an email infrastructure product built specifically to route inbound email through AI agents. Every inbound message is scanned for prompt-injection, scored for sender reputation, and emitted as a structured event that can include opt-in classification (intent and entities). The product is designed for developer integration via SDKs (TypeScript, Python, MCP) and aims to make email an actionable event stream for agent code.
The site presents a live demo/walkthrough of an inbound message flowing through an injection scan, structured event creation, and then into user code. The product is currently in closed beta (cohort 1) with cohort openings planned for Q3 2026, and offers both monthly tiers and per-event metered pricing.
Mails.ai provides email infrastructure for AI agents: inbound emails are scanned for prompt-injection, scored for sender reputation, optionally classified into intent/entities, and delivered as structured events to agent code via SDKs and MCP.
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Claim this listing for $29Key Features
Prompt-injection scanning
A six-category prompt-injection scanner runs on every inbound; events include an injection_score and messages above thresholds can be quarantined.
Sender reputation & suppression
Every sender is scored with sender_reputation; the platform supports automatic pausing/throttling of bad actors and 'autoreputation-based throttle' with complaint auto-pause behavior described (0.3%).
Opt-in classification (intent & entities)
When enabled, inbound events include parsed intent and extracted entities (e.g., date, time, email) to produce structured reply events for agents.
Structured reply events
Inbound emails are emitted as structured JSON events including fields like id, agent, from, subject, body, injection_score, sender_reputation, and opt-in intent/entities.
SDKs & MCP support
Client libraries and examples are provided in TypeScript, Python, and MCP for integrating agent logic with the Mails.ai event stream.
Metered per-event billing
Pricing is presented per event (send, inbound scan, optional classification) rather than per mailbox, allowing quiet months to cost little or nothing.
Dedicated IP & architecture
The site lists architecture-related features such as Dedicated IP and MCP server for developer deployment and routing.
Integrations & runtimes
Works with various runtimes via MCP and lists compatibility with runtimes and tooling (examples shown on the site).
Pricing
Free plan available ($0 monthly).
Free
$0- Entry-level access (monthly tier listed on site)
Pro
$20 per month- Pro monthly tier (details on site)
Scale
$99 per month- Scale monthly tier (details on site)
Use Cases
Agent-driven email handling
Route inbound email into AI agents that parse intent/entities and respond or take actions automatically (e.g., schedule demos, send invites).
Security & prompt-injection mitigation
Protect agent workflows from malicious prompt-injection by scanning every inbound and quarantining high-risk messages before agent execution.
Reputation-based suppression
Automatically throttle or pause senders with low reputation to reduce spam, abuse, and noisy inputs into agent pipelines.
Pay-per-event usage for variable workloads
Support sporadic or seasonal workloads with per-event metering so quiet periods incur minimal cost.
Integrations
MCP
Platform messaging runtime — Mails.ai works with your runtime via MCP.
Claude
Listed as a compatible runtime/integration on the site.
CodeCursor
Listed as a compatible runtime/integration on the site.
Cline
Listed as a compatible runtime/integration on the site.
Windsurf
Listed as a compatible runtime/integration on the site.
OpenAI Agents
Listed as a compatible runtime/integration on the site.
LangGraph
Listed as a compatible runtime/integration on the site.
Benefits
Limitations
Frequently Asked Questions
Claim this listing to publish FAQs.
Getting Started
- 1 Sign up or reserve a seat for cohort 1 (closed beta) and get your API key.
- 2 Install the SDK: npm install @mailsai/sdk.
- 3 Configure an agent (example: mails.agent('sarah', { domain: 'yourcompany.com' })).
- 4 Wire up an onReply handler to receive structured events (intent, entities, injection_score, sender_reputation) and implement your agent logic.
- 5 Read the docs and API reference on the site for detailed integration and configuration.
Support
Support and contact via [email protected] (listed on the site).
docs
Documentation and API reference available on the site (Docs, API reference, Read the docs).
blog
Blog and changelog listed under Resources on the site.
API
Docs and API reference available on the site: https://mails.ai/?via=toolpilotai34
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