Mails.ai Pricing 2026
Complete pricing guide for Mails.ai — plans, costs, and free options.
💰 Mails.ai Pricing Overview
Mails.ai uses a freemium pricing model. Free tier available with optional paid upgrades. Current pricing: Free $0/mo: 3,000 events/month, 1 agent, TypeScript SDK and REST, MCP server, magic-link signup with no card. Pro $20/mo: 50K sends and 50K inbound replies/month, 5 agents, HMAC-signed webhooks, injection scanning on every inbound. Scale $99/mo: 250K sends, 500K inbound, unlimited agents, per-agent allowlists and budgets, dedicated IP on request. A metered plan at $0.001/send, $0.002/inbound and $0.003/classify is listed as coming soon.. Mails.ai is a popular ai agent infrastructure tool known for email api for ai agents with per-inbound prompt-injection scoring, sender reputation and no cold email. You can get started with Mails.ai for free and upgrade to a paid plan as your needs grow.
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Mails.ai Plans & Pricing
Free
$0/mo: 3,000 events/month, 1 agent
Pro
: 50K sends and 50K inbound replies/month, 5 agents
Scale
: 250K sends, 500K inbound, unlimited agents, per-agent allowlists and budgets, dedicated IP on request
A metered plan at
/send
$0.002/inbound and
/classify is listed as coming soon.
* Pricing information is based on publicly available data and may not reflect current promotions, annual discounts, or regional pricing. Visit the official Mails.ai website for the latest pricing.
Is Mails.ai Free?
Mails.ai offers a free tier that lets you try the platform without any payment. The free plan typically includes core features with usage limits. For power users, paid plans unlock additional features, higher limits, and priority support.
Mails.ai Feature Comparison
Here's how Mails.ai's key features are typically distributed across pricing tiers. Feature availability is estimated based on common SaaS patterns — check the official site for exact tier details.
| Feature | Free | Pro | Scale | A metered plan at | $0.002/inbound and |
|---|---|---|---|---|---|
| Real inbox for an agent in one API call | ◐ | ✓ | ✓ | ✓ | ✓ |
| Six-category prompt-injection scanner on every inbound | ◐ | ✓ | ✓ | ✓ | ✓ |
| Structured reply events with injection score and sender reputation | ◐ | ✓ | ✓ | ✓ | ✓ |
| Opt-in intent and entity classification | — | ✓ | ✓ | ✓ | ✓ |
| Cold email blocked at the API level | — | ◐ | ✓ | ✓ | ✓ |
| Custom domains with per-domain DKIM signing | — | ◐ | ◐ | ✓ | ✓ |
| TypeScript SDK, REST, HMAC webhooks and an MCP server | — | — | ◐ | ✓ | ✓ |
✓ = Full access · ◐ = Limited · — = Not available. Feature availability is estimated and may vary.
Is Mails.ai Worth It?
Mails.ai is a freemium ai agent infrastructure tool that offers 7 key features including Real inbox for an agent in one API call, Six-category prompt-injection scanner on every inbound, Structured reply events with injection score and sender reputation. Mails.ai gives an AI agent its own real email address in a single API call — send, receive and reply — and is built around the assumption that the agent, not a human, is reading the inbox. Every inbound message arrives as a structured reply event carrying an injection score and a sender reputation figure, with intent and extracted entities available as an opt-in classification step, so an agent acts on typed fields rather than parsing a message body. A six-category prompt-injection scanner runs on every inbound and flags the event as quarantined above a 0.95 score, which is the security posture the whole product is organised around: an agent with an inbox is an agent with an untrusted input channel, and the platform treats it that way by default. Cold email is blocked at the API rather than in a terms-of-service clause, which is a deliberate deliverability decision — the reputation graph only works if the platform is not also carrying spam. Free sends come from a workspace subdomain with zero DNS setup; paid plans add custom domains verified with DNS records and per-domain DKIM signing. It ships a TypeScript SDK, REST API, HMAC-signed webhooks with an SDK reactor, per-agent allowlists and budgets, and an MCP server. The vendor states plainly that it has no sales team and no contact-us enterprise tier.
✅ Mails.ai is a good choice if you need:
- •Real inbox for an agent in one API call
- •Six-category prompt-injection scanner on every inbound
- •Structured reply events with injection score and sender reputation
- •Opt-in intent and entity classification
- •Cold email blocked at the API level
💡 Value Assessment
With a free tier available, Mails.ai is an easy recommendation for anyone looking to try ai agent infrastructure tools without financial commitment. The paid plans offer good value for power users who need the additional features and higher usage limits.
Mails.ai Key Features
Mails.ai comes packed with features that make it a strong contender in the ai agent infrastructure space. Here's what you get:
Integrate Mails.ai into your own applications and workflows via the API.
Available in the free plan with limits — Six-category prompt-injection scanner on every inbound helps you work more efficiently with Mails.ai.
Available in the free plan with limits — Structured reply events with injection score and sender reputation helps you work more efficiently with Mails.ai.
Available in the free plan with limits — Opt-in intent and entity classification helps you work more efficiently with Mails.ai.
Powered by advanced AI models, Mails.ai delivers intelligent content generation capabilities.
Powered by advanced AI models, Mails.ai delivers intelligent content generation capabilities.
Available in the free plan with limits — TypeScript SDK, REST, HMAC webhooks and an MCP server helps you work more efficiently with Mails.ai.
Ready to try Mails.ai?
Visit the official website for the latest pricing and to get started.
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Get a Sponsored Badge →Frequently Asked Questions
Is Mails.ai free to use?
Yes, Mails.ai offers a free tier that you can use without paying. Paid plans starting at $20/month unlock additional features and higher usage limits.
How much does Mails.ai cost in 2026?
As of 2026, Mails.ai pricing is: Free $0/mo: 3,000 events/month, 1 agent, TypeScript SDK and REST, MCP server, magic-link signup with no card. Pro $20/mo: 50K sends and 50K inbound replies/month, 5 agents, HMAC-signed webhooks, injection scanning on every inbound. Scale $99/mo: 250K sends, 500K inbound, unlimited agents, per-agent allowlists and budgets, dedicated IP on request. A metered plan at $0.001/send, $0.002/inbound and $0.003/classify is listed as coming soon.. Pricing may vary based on billing cycle (monthly vs annual) and region. Visit the official Mails.ai website for the most current pricing.
What is the cheapest Mails.ai plan?
The cheapest option is the free tier. If you need premium features, the most affordable paid plan is Pro at $20/month.
Is Mails.ai worth the price?
Mails.ai is well-regarded in the agent-infrastructure space, offering features like Real inbox for an agent in one API call, Six-category prompt-injection scanner on every inbound, Structured reply events with injection score and sender reputation. Whether it's worth the investment depends on your specific needs, usage volume, and budget. The free tier lets you try it before committing to a paid plan.
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