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Terms & Conditions

Last updated: November 2026

These terms are an agreement between you and Grayic LLC ("Grayic", "we", "us") for using the free Mailzo app and the services that come with it: the optional Mailzo account, app updates and our website (together, "Mailzo"). By using Mailzo you agree to these terms. If you don't agree, please don't use it.

1. Who can use Mailzo

You must be at least 16, or the age of digital consent where you live, to use Mailzo. If you use Mailzo for a company, you confirm you're allowed to accept these terms for it.

2. The app is open source

The Mailzo app's code is released under the GNU Affero General Public License v3.0 (AGPL-3.0). That licence, not these terms, decides what you may do with the code: use it, study it, change it and share it under the licence's conditions. Nothing in these terms takes away any right the licence gives you.

These terms cover the services we run (the account server, updates and the website) and the Mailzo name and logo. The name and logo aren't covered by the open-source licence.

3. Mailzo is free

The Mailzo app and the Mailzo account are free. If you use AI with your own key or plan, you pay that AI company directly under their terms. Grayic doesn't charge you for it.

4. Your email accounts

Mailzo connects to email accounts you already have with other providers, such as Google, Microsoft or Apple. You're responsible for having permission to use those accounts, and for following their rules. We're not responsible for those providers or their services.

5. Your Mailzo account

The account is optional. If you create one:

  • Keep access to your email and your devices safe. Anyone who can sign in to your email can sign in to your Mailzo account.
  • Keep your recovery key somewhere safe. Your vault is encrypted with a key only your devices hold, so if you lose all your devices and your recovery key, we can't recover your vault.
  • Tell us at hello@getmailzo.com if you think someone else has accessed your account.

You can delete your account at any time from the app.

6. Your content

Your emails, contacts, notes and everything else in Mailzo belong to you. We don't claim any ownership of them. Your email stays on your Mac and with your email provider. We don't store it.

7. AI features

AI features are optional. When you use your own AI key or plan, you're using that AI company's service under its own terms.

AI can make mistakes. Check AI-written replies, summaries, translations and answers before relying on them or sending them. Mailzo never sends an email because of AI on its own, but you're responsible for what you send.

If you connect an outside AI app, you decide what it may do. You're responsible for the actions you allow it to take.

8. Sending from your Mac

Scheduled emails and follow-ups are sent from your Mac while Mailzo is running. If your Mac is off, asleep or offline, they'll go out the next time Mailzo can send them. Don't rely on them for anything that must go out at an exact time.

9. Using Mailzo properly

Don't use Mailzo for spam, fraud, harassment, illegal content, or attacks on Mailzo, other people or email providers.

10. Updates and changes

Mailzo is new and changes often. We may add, change or remove features. The app checks for updates and installs them only when you choose to restart.

11. Feedback and contributions

If you send us ideas or suggestions, we may use them without owing you anything. Code contributions to the open-source project are covered by the project's contribution guidelines and licence.

12. Ending things

You can stop using Mailzo at any time, delete your account in the app, and remove the app from your Mac.

We may suspend or close a Mailzo account that breaks these terms, or to protect Mailzo, other users or email providers. Where we reasonably can, we'll warn you first. This affects only the account. The app on your Mac keeps working with your inboxes.

13. No warranty

Mailzo is free and provided "as is" and "as available". As far as the law allows, we give no warranties, express or implied, including that Mailzo will be uninterrupted, error-free, or fit for a particular purpose. The AGPL licence includes its own disclaimer of warranty for the code.

Mailzo works on top of your email provider. Keep your own copies of important email. Your provider usually holds the main copy of your mail.

14. Limit of liability

As far as the law allows:

  • Grayic isn't liable for indirect, incidental, special, consequential or punitive damages, or for lost profits, data, or goodwill.
  • Grayic's total liability for any claim about Mailzo is limited to US$50.

Some places don't allow these limits, so they may not fully apply to you. Nothing in these terms limits rights you have under consumer law that can't be waived.

15. Governing law and disputes

These terms are governed by the laws of the State of Wyoming, USA, without regard to its conflict-of-law rules. Disputes will be handled in the courts of Wyoming, unless the consumer law of where you live gives you the right to use your local courts.

Before going to court, please email hello@getmailzo.com so we can try to sort it out together.

16. Changes to these terms

If we make a change that matters, we'll update the date at the top and tell you in the app or by email at least 14 days before it takes effect. If you keep using Mailzo after that, you accept the new terms.

17. Other legal bits

  • If any part of these terms can't be enforced, the rest still applies.
  • If we don't enforce a part of these terms straight away, we can still enforce it later.
  • You can't transfer these terms to someone else without our permission. We may transfer them if Grayic is sold or merged.
  • These terms, together with the pages they mention, are the whole agreement between us about Mailzo.