Mails.ai

What It Does

Mails.ai is a specialized email infrastructure platform built from the ground up for AI agents. It provides a complete email handling solution that includes automatic prompt injection detection, sender reputation scoring, and optional intent classification on every inbound message. The platform handles the complexity of email delivery, security, and reputation management so developers can focus on building agent logic.

Who It's For

Mails.ai is designed for developers building autonomous AI agents that need to send and receive emails safely. It's ideal for teams creating customer service agents, sales assistants, scheduling bots, or any AI system that communicates via email. The platform integrates seamlessly with popular AI development environments like Claude Code, Cursor, Cline, and OpenAI Agents.

Key Features & Capabilities

• Built-in Injection Scanning: Six-category prompt-injection scanner automatically flags suspicious content before it reaches your agent, with auto-quarantine above 0.95 confidence
• Sender Reputation Graph: Per-agent reputation scoring built from real engagement data, with automatic throttling and complaint-based pausing at 0.3%
• Structured Reply Events: Every inbound arrives with injection_score and sender_reputation; optional classification adds intent extraction, entity parsing, and urgency scoring
• MCP Server Integration: Native Model Context Protocol server publishes with the SDK, enabling drop-in integration with Claude Code, Cursor, Cline, and other MCP-compatible tools
• Multi-Vendor Architecture: Send pipeline with reputation management and automatic failover across multiple email providers
• Usage-Based Pricing: Pay per event model ($0.001 per send, $0.002 per inbound scan, +$0.003 for optional classification), with monthly tiers available

Typical Workflows

Developers integrate Mails.ai using a simple SDK (TypeScript, Python, or MCP) to create email-enabled agents. When an inbound message arrives, the platform automatically scans for injection attempts, scores sender reputation, and optionally extracts intent and entities using a 2-call classifier. The structured event is then passed to your code with all security metadata attached. Your agent can then decide how to respond, with sends routed through the platform's reputation-managed delivery pipeline.

What Differentiates It

Unlike generic email APIs, Mails.ai is purpose-built for the unique security and reputation challenges of AI agents handling email. The platform's injection scanning and per-agent reputation isolation protect against prompt injection attacks and sender abuse, while the optional classification layer reduces the need for agents to run their own LLMs for every inbound. Dedicated IP options and workspace-level isolation ensure enterprise-grade reputation management.