Plain-language terms.

1. The service

Mails.ai (“we”, “us”) provides an email API for AI agents — transactional and reply-event infrastructure on shared and dedicated pools. By creating an account or sending requests to the API you agree to these terms.

2. Eligibility

You must be 16 or older and have authority to bind the legal entity you represent. The service is sold to developers and businesses; not directed at consumers or children.

3. Your account

You’re responsible for keeping API keys secret. Sharing or leaking them is on you; we can’t recover a lost key (they’re SHA-256 hashed at rest). Rotate via the dashboard if a key may be compromised. You’re responsible for activity on your account, including activity by your agents, team members, or anyone you grant access to.

4. Acceptable use

You agree NOT to use the service to:

• Send unsolicited bulk email (“spam”). B2B prospecting is permitted under the same rules Resend follows: every send must include a valid sender address, your company name, an explicit disclosure of why you’re contacting the recipient, and an unsubscribe mechanism honored within 7 days. You must use organizational/business addresses, not personal addresses. Auto-suspension at 0.3% complaint rate kicks in regardless of who’s sending.
• Send mail you don’t have permission to send (phishing, impersonation, relay abuse).
• Distribute malware, CSAM, content that incites violence, content infringing third-party IP, or content unlawful in the recipient’s jurisdiction.
• Send mail in the categorically prohibited categories regardless of opt-in: pornography or sexually explicit content, escort services, pharmaceutical products, gambling services, multi-level marketing or pyramid schemes, get-rich-quick opportunities, credit repair or get-out-of-debt services, short-term / payday loan services, list brokers or list rental services, or selling “Likes” / followers for a social media platform.
• Attempt to circumvent our rate limits, classifier, suppression list, or behavioral routing.
• Reverse-engineer, scrape, or otherwise probe the platform for security research outside the disclosure program at /security.
• Use AI-agent automation to harm individuals, including unauthorized surveillance, harassment, or non-consensual content generation.

We run on AWS SES and comply with AWS’s Acceptable Use Policy. Anything AWS prohibits is also prohibited here regardless of these terms.

5. Billing

Pricing is published at /pricing. Monthly tiers (Pro, Scale) bill in advance; per-event Metered tier bills monthly in arrears based on usage records reported to Stripe ($0.001/send + $0.002/inbound (+$0.003 opt-in classify)); Dedicated IP add-on bills monthly in advance. All billing is processed by Stripe; you authorize Stripe to charge the payment method on file.

Failed payments put your subscription in past_due status, which blocks new sends but preserves your data. After 14 days unresolved, sends remain blocked and the account moves to a payment-suspended state; after 60 days unresolved we may close the account with reasonable notice.

Refunds: we don’t pro-rate mid-period for downgrades or cancellations. If we materially fail to deliver the service (extended downtime, lost data attributable to our infrastructure), we issue a service credit per the SLA policy at /status.

6. Suspension and termination

We may suspend or terminate your account for: (a) violation of section 4 (Acceptable Use), (b) sustained bounce or complaint rate above platform thresholds (auto-suspend fires at 0.3% complaint, well before AWS’ 0.5% threshold), (c) failure to pay after notice, (d) legal compulsion, or (e) substantial security risk to other customers or the platform. We aim to give notice and a chance to cure for non-emergency suspensions.

You may close your account at any time from the dashboard or by emailing support@mails.ai. On closure, your data is deleted within 30 days per the privacy policy.

7. Service level

Uptime targets, monitored surfaces, and credit policy are at /status. Service credits are your sole remedy for an SLA miss.

8. Intellectual property

You keep all rights to the email content you send and receive through the service. We get a limited license to process that content for the purpose of providing the service (sending, parsing, classifying, storing your messages against your workspace). You grant us anonymized-aggregate use rights only — e.g., per-call cost averages, classifier-accuracy stats — never identifiable content. The platform itself (code, classifiers, brand) is ours.

9. Disclaimer of warranties

The service is provided “as is”. We don’t guarantee that every email reaches every recipient (deliverability is governed by receiving providers we don’t control), that the classifier is perfect, or that the service is uninterrupted. We disclaim, to the maximum extent permitted by law, all implied warranties including merchantability and fitness for a particular purpose.

10. Limitation of liability

To the maximum extent permitted by law, our aggregate liability for any claim arising from or related to the service is capped at the greater of (a) the fees you paid us in the 12 months preceding the claim, or (b) US $100. Neither party is liable for indirect, incidental, consequential, special, or punitive damages — including lost profits, lost data beyond what reasonable backups would have prevented, or business interruption — even if advised of the possibility. Some jurisdictions don’t allow exclusions of certain damages; these limits apply only to the extent allowed.

11. Indemnification

You’ll defend, indemnify, and hold us harmless from third-party claims arising from your use of the service in violation of these terms or applicable law — including any claim that email you sent through the service was unsolicited, infringing, or unlawful.

12. Changes

We may update these terms. Material changes (new restrictions, fee changes, liability shifts) get at least 30 days’ notice via email + a /changelog entry. Continued use after the effective date constitutes acceptance. Non-material edits (typos, restructuring without scope change) ship silently.

13. Governing law and disputes

These terms are governed by the laws of England and Wales, without regard to conflict-of-laws principles. Disputes will be resolved in the courts of London, England, except that either party may seek injunctive relief in any competent court to protect IP or confidential information. If your local law gives you mandatory consumer rights that override this clause, those override.

14. Severability and entire agreement

If any clause is held unenforceable, the rest stays in effect. These terms, plus the privacy policy, sub-processor list, and any signed DPA, are the entire agreement between us regarding the service.

15. Contact

Questions about these terms: support@mails.ai.