Terms of use

Effective November 9, 2026

These terms apply to your use of mail-api.io, including this website, the API, and webhooks (the “service”). mail-api.io (“we”) provides the service. When you create an account, create an API key, or use the service, you agree to these terms and to our privacy policy. If you use the service for an organization, you agree for that organization, and you confirm that you have the authority to do so. If you do not agree, do not use the service.

Your account

• You must be at least 18 years old, or the age of majority where you live.
• Sign in with an email address that you control. You are responsible for all activity in your account.
• If you think someone used your account or an API key without permission, tell us at once at sean@lmsystems.ai.

API keys

An API key gives full access to every mailbox connected to your account. Keep it secret, like a password. Do not put it in code that runs in a browser or in a public repository. You are responsible for every request made with your keys, including requests from AI agents and other software that you give a key to. If a key is exposed, revoke it in your dashboard.

Connecting mailboxes

• Connect only mailboxes that you own, or that you have permission to connect.
• When you connect a mailbox, you authorize us to access it to do what you or your API keys ask, and to detect new mail, as our privacy policy describes.
• The terms of your mail provider still apply to your mailbox. You must follow them, including their limits on automated access and on sending.
• We are not affiliated with or endorsed by Google, Yahoo, Apple, AOL, Fastmail, Zoho, or Namecheap. A provider can change or stop our access at any time, and this can affect the service.

AI agents and automated actions

The service does what your requests say. It does not check whether a request is what you intended. If your AI agent sends a message, replies, moves a message to Trash, or changes a message, we carry out that request. You are responsible for the actions of the software you connect, including its mistakes.

Mail that you receive can contain text written to mislead an AI agent. Treat all message content as untrusted, and HTML in particular.

Acceptable use

You must not use the service to:

• send spam, unsolicited bulk mail, or mail that breaks anti-spam laws such as the CAN-SPAM Act;
• send phishing, malware, or deceptive content, or pretend to be another person or organization;
• access a mailbox without permission, or collect personal data about others without a legal basis;
• harass, threaten, or harm others, or share illegal content;
• infringe the intellectual property or privacy rights of others;
• get around our rate limits or security, or the limits of a mail provider;
• probe or test the service for weaknesses without our written permission, or disrupt the service for other users;
• resell or rent access to the service itself without our written permission;
• break any law.

We can investigate suspected misuse and act on it, as described below.

Webhooks

You are responsible for the URLs you register and the servers behind them. Check the signature of each webhook before you trust it. If your server does not accept a webhook, we try again, up to 12 attempts, and then stop. We do not promise that every webhook arrives, or that webhooks arrive in order. Use the API to confirm the state of a mailbox.

Your content

Your mail, attachments, and other content stay yours. You give us permission to access, process, and send your content only to provide the service to you, as our privacy policy describes. We do not sell your data, use it for ads, or use it to train AI models.

If you send us feedback or ideas, we can use them with no obligation to you.

Fees

We do not charge for the service now. If we add paid plans, we will tell you before any charge applies, and you can choose to stop using the service.

Changes to the service

We can change, add, or remove features. Before we remove a feature or make a breaking change to the API, we will try to tell you in advance. We do not promise any level of availability.

Suspension and termination

You can stop using the service at any time. To delete your account, email sean@lmsystems.ai.

We can suspend or end your access at once, without notice, if you break these terms, if your use puts the service, other users, or a mail provider at risk, or if the law requires it. We can also end the service for everyone after 30 days’ notice by email. When your access ends, we delete your data as our privacy policy describes. The sections on your content, disclaimers, limitation of liability, indemnity, and general terms stay in effect after your access ends.

Disclaimers

The service is provided “as is” and “as available”. To the fullest extent the law allows, we disclaim all warranties, express or implied, including warranties of merchantability, fitness for a particular purpose, title, and non-infringement. We do not promise that the service will be uninterrupted, secure, or free of errors, or that any message will be delivered.

Limitation of liability

To the fullest extent the law allows, we are not liable for any indirect, incidental, special, consequential, or punitive damages, or for any loss of profits, revenue, data, or goodwill, even if we were told that they were possible. Our total liability for all claims about the service is limited to the greater of the amount you paid us for the service in the 12 months before the claim, or US$100. Some places do not allow these limits, so they may not apply to you.

Indemnity

You will defend and indemnify us, and hold us harmless, against claims, losses, and costs, including reasonable legal fees, that come from your use of the service, your content, the actions of software you connect, or your breach of these terms or of the law.

Changes to these terms

We will post any change on this page and update the effective date. If a change is significant, we will also tell you by email at least 14 days before it takes effect. If you keep using the service after a change takes effect, you accept the new terms.

General

• These terms and our privacy policy are the whole agreement between you and us about the service.
• If a court finds part of these terms unenforceable, the rest stays in effect.
• If we do not enforce a right, we do not give it up.
• You cannot transfer these terms without our written consent. We can transfer them as part of a merger, acquisition, or sale of assets.
• Neither of us is liable for delays caused by events beyond reasonable control.

Contact

Questions about these terms go to sean@lmsystems.ai.