Developer email infrastructure for AI agents: sends mail and returns structured inbound events with injection and reputation scores.
What it does
Mails.ai is email infrastructure built for AI agents, currently in closed beta. It sends email via API and delivers every inbound reply as a structured event carrying an injection score and sender reputation, with optional intent and entity classification, plus built-in prompt-injection scanning.
Core features
Structured inbound reply events via SDK/webhooks
Prompt-injection scanning on every inbound
Per-sender reputation scoring and auto-throttling
Opt-in intent and entity classification
TypeScript, Python, and MCP support
Dedicated IP add-on for reputation isolation
Best for
→Giving AI agents an email inbox and sending ability
→Routing inbound replies by intent
→Protecting agents from prompt-injection via email
→Building email-driven agent workflows
Pricing
Free
Pro
$20/mo
Scale
$99/mo
Dedicated IP add-on
$50/mo