Privacy Policy

1. The short version

mailWarmer is a free, open-source Chrome extension that keeps your inboxes active. It never reads, opens, or sends from your inbox. Your email addresses and profile details stay on your device — they are only ever typed into the newsletter signup forms you choose, exactly as you would do by hand. There is no account to create and no payment to make.

2. What stays on your device

Everything you enter is stored locally in your browser, visible only to the extension:

• The email addresses you add and their labels
• Your optional profile (name, location, and similar fields used to fill signup forms)
• Your newsletter list and any custom newsletters you add
• Your signup history and activity log
• The results of the optional cookie warm-up

None of this is sent to us or to anyone else.

3. No server, no statistics

mailWarmer has no server. The extension never contacts us or any analytics service: no usage statistics, no installation ID, no tracking. The curated newsletter list ships inside the extension and only changes when the extension itself updates through the Chrome Web Store.

The only requests it makes are the ones you start: the newsletter signups you run (sent to each newsletter's own website) and, if you use it, the cookie warm-up visits.

4. What we never collect

We do not collect:

• Your email addresses or their contents
• Your profile details (name, address, phone, etc.)
• Your browsing history or the pages you visit
• Keystrokes, screenshots, or screen recordings
• Usage statistics or analytics of any kind
• Payment or financial information (there are no payments)
• Any personally identifiable information

5. Cookie warm-up

The optional Cookies tab visits a few well-known websites in the background and accepts their cookie banners, then reads back the cookies those visits left in your browser. This all happens locally and is shown only to you — the captured cookies are never sent anywhere.

6. Third-party services

When mailWarmer subscribes you to a newsletter, you are signing up with that newsletter's own provider (for example a Substack publication or another email service). Those providers have their own privacy policies governing the address you submit, just as they would for a signup you did yourself.

7. Your control

Because your data lives on your device, you can:

• Edit or delete any email or profile field at any time
• Clear your history and log
• Remove the extension to erase everything it stored

8. Children's privacy

mailWarmer is not intended for children under 13, and we do not knowingly collect any information from them.

9. Changes to this policy

We may update this Privacy Policy from time to time. Any changes will be posted on this page with an updated date above.

10. Contact

mailWarmer is open source. Questions about privacy are best raised in the open, so anyone can see the answer — please open an issue on GitHub.