ReachInbox finds sales prospects, drafts personalized cold emails, and automates outbound email sequences.
Mails.ai
Mails.ai provides an email API for agents to send, receive, parse, and reply to messages from a programmatic inbox.
About Mails.ai
Mails.ai provides an email API that gives an AI agent its own address to send, receive and reply to messages. The homepage describes integration in about six lines of code, with the same shape in TypeScript, Python and MCP.
Inbound mail is scored for prompt injection and sender reputation and delivered as structured reply events, with optional intent and entity parsing on paid plans. Cold outreach is refused at the API and not sent, and sends and inbound processing use separate allowances.
Key features
- Programmatic inbox to send, receive and reply via API
- API-level blocking of cold outreach with refusal code
- Inbound prompt-injection scoring before agent action
- Structured reply events with injection and reputation scores
- Optional intent and entity classification on paid plans
- Per-agent reputation scoring with auto-pause and throttle
Best for: Developers building AI agents that need to send and receive email programmatically.
Good for
- Cold-outreach sends are refused by the API with a reason code
- Every inbound includes injection score and sender reputation
- Sends and inbound items are counted in separate allowances
Watch out for
- Cannot be used for cold outreach; such sends are not delivered
- Intent and entity parsing is opt-in and limited to paid plans
Mails.ai at a glance
- Website
- mails.ai
- Category
- AI & Machine Learning › AI Business Tools
- Type
- Online tool
- Pricing
- Not confirmed. Check the site
- Platforms
- Web
- Open source
- Not stated
- Language
- English
- Last checked
- Oct 5, 2026 · Online when checked
- Listed
- Oct 5, 2026
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Mails.ai FAQ
Can I use Mails.ai for cold outreach?
No. Cold outreach is blocked at the API and returns 422 cold_email_prohibited without sending.
What information comes with an inbound message?
A structured event includes injection_score and sender_reputation, plus intent and entities when classification is enabled.
How do developers add email to an agent?
About six lines of code, with SDK shapes for TypeScript, Python and MCP.
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