Last updated: November 2026
Mailzo is a free, open-source email app for the Mac made by Grayic LLC ("Grayic", "we", "us"). This policy explains what information Mailzo handles, where it goes, and the choices you have. It covers:
We wrote this in plain English. If anything is unclear, email hello@getmailzo.com.
Everything you see in the app is stored only on your Mac:
The mail database is encrypted on your Mac. Your email passwords and sign-in tokens are kept in the Mac's Keychain, never in the database.
To work, the app connects directly to these services. None of these connections go through Grayic, except the update check.
| Service | Why | What it receives |
|---|---|---|
| Your email provider (e.g. Google, Microsoft, Apple, or your own mail server) | To download, send and organise your email | Your login and the actions you take, as with any email app |
| Your calendar provider, if you connect one | To show and update your calendar | Your calendar events |
| Mozilla's public email settings directory (autoconfig.thunderbird.net) | To find your email server settings automatically | Only the part of your address after the @ (for example, gmail.com) |
| Gravatar | To show a sender's picture | A scrambled (hashed) version of the sender's address, never the address itself |
| DuckDuckGo icons | To show a company's logo | Only the company's website domain |
| The AI service you choose, if you turn AI on | See section 3 | Only what you ask it to work on |
| updates.getmailzo.com (Grayic) | To check for and download new versions of the app | Your app version and the usual technical details of an internet request, such as your IP address |
You can turn off sender pictures and logos in Settings › Privacy.
Emails you schedule, and follow-ups you set up, are sent from your Mac. They go out while Mailzo is running. Nothing is stored on our servers to send them for you.
Many emails contain hidden "tracking pictures" that tell the sender when you opened them. Mailzo blocks known trackers and tells you which ones it blocked. It also removes tracking codes from links. You can choose to hide all pictures by default in Settings › Privacy.
If you use encrypted email (OpenPGP), your private keys stay on your Mac. Encrypted emails are never sent to any AI service.
You only need an account if you want to use Mailzo on more than one device or share an inbox with a team. It's free. If you create one, our account server handles:
| What | Why | Can we read it? |
|---|---|---|
| Your main email address | To send you sign-in codes and important account notices | Yes |
| The names of your devices (e.g. "Work MacBook") | So you can see and remove devices | Yes |
| Your encrypted vault: your inbox list, email passwords and synced settings such as rules, snoozes and contacts | So your other devices can use them | No. It's encrypted with a key only your devices hold. We can't open it. |
| Team information (who is in the team, who's handling which email, private notes) | So your team stays in sync | No. It's encrypted with a team key we never see. Conversations are identified only by scrambled numbers. |
Your emails themselves are never sent to the account server. Each team member's Mac downloads mail directly from the shared inbox.
We use Emailit to send sign-in codes and account emails, so it receives your email address and the email we send you.
AI in Mailzo is optional and off until you turn it on in Settings › AI. You choose where it runs:
Mailzo sends the AI only what the feature needs: for example, one email to summarise, or a short note on how you write so replies sound like you. AI never sends an email by itself. Encrypted emails and text hidden inside emails are never sent to AI.
If you connect an outside AI app (such as Claude on your Mac) through Settings › MCP, it talks to Mailzo on your Mac only. You decide what it may do with a switch for each action, and it must ask before sending any email unless you turn that check off. You can see everything it did in Settings › AI activity.
See our AI and Your Data page for more.
Our website doesn't use tracking cookies or analytics. See our Cookie Policy for details.
If you email us or sign up for updates, we keep your email address and message so we can reply.
Where privacy laws such as the GDPR apply, we rely on:
Depending on where you live, you may have the right to:
Most of your data is on your own Mac, so it's already in your control. For anything on our account server, email hello@getmailzo.com. We'll reply within 30 days. We may need to confirm it's really you first. You can also complain to your local data protection authority.
California and other US states: we don't sell or share your personal information for advertising, and we don't use it to profile you. You won't be treated differently for using your privacy rights.
We share information only:
We never sell your information.
Grayic is based in the United States. If you create an account, your account information is processed in Germany. Where needed, we use standard legal safeguards such as the EU Standard Contractual Clauses.
Mailzo isn't meant for children under 16. We don't knowingly collect information from them. If you think a child has given us information, email hello@getmailzo.com and we'll delete it.
If we change this policy in a way that matters, we'll update the date at the top and tell you in the app or by email before the change takes effect.
Grayic LLC
30 N Gould St Ste R
Sheridan, WY 82801, USA
hello@getmailzo.com
