Preen

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Start Guide here :https://github.com/JR91387/Preen-AI-email-sorting/wiki/Getting-Started

Preen (to smooth or clean feathers) sorts your Thunderbird mail with Jev, a fast, low-cost AI decision model from TypeSafe. For each message, Jev judges what kind of mail it is, and Preen tags it: Real person, Needs reply, Junk, and one of your categories. It starts with Personal, Work, Bills and Codes (sign-in and verification codes). You can edit, remove or add categories.

How to use it
1. Open Preen's settings from the toolbar button or the Add-ons Manager.
2. Follow Getting started: read what Preen sends, agree, paste your API key and click Test connection.
3. Right-click a few messages and choose Preview with Preen. Nothing changes.
4. When the previews look right, choose Classify with Preen, or pick mailboxes to sort new mail automatically.

You stay in control
Your settings decide which tags are applied and how sure Preen must be. Every run can be undone, and daily limits cap how much mail Preen sends.

What it sends
Preen sends each message it sorts only to the provider you choose, OpenRouter or TypeSafe, with your own API key. It sends the sender, subject, date, recipient counts, attachment names, a few yes or no facts from the headers, and your categories. The Deep setting also sends up to about 2,000 characters of the message text. Card, bank and ID numbers are replaced before sending. Preen sends nothing to its developer.

What you need
Thunderbird 140 or newer, and an API key from OpenRouter or TypeSafe. These are paid services that are not affiliated with this add-on and you need your own accounts to use that service. Make a key just for Preen and give it a credit limit.

Source code: https://github.com/JR91387/Preen-AI-email-sorting
Questions: open an issue at https://github.com/JR91387/Preen-AI-email-sorting/issues

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Last updated: 9 November 2026. This policy covers Preen 0.0.29.

Preen is a Thunderbird add-on that sorts your mail with an AI model. This page lists what Preen sends, where it goes, and what it keeps on your computer. You can also read it inside Preen, under Settings, Provider & cost, Privacy policy.
Where your data goes

Preen sends data to one place: the AI provider you choose in its settings, either OpenRouter or TypeSafe. It uses your own API key. Preen sends nothing until you agree in its settings.

Preen sends nothing to its developer. It has no usage statistics, no crash reports and no server of its own. The add-on can only connect to these two addresses:

https://openrouter.ai/api/v1/systemone
https://api.typesafe.ai/v1/systemone

What each request contains

Preen sends one request for each message it sorts. Every request contains:

the sender's name and address
the subject and the date
how many people the message was sent and copied to, but not their addresses
the names of attachments, but not their contents
yes or no answers that Preen works out from the headers on your computer: whether the message looks automated, looks written by a person, came from a mailing list, or failed a DMARC check. DMARC is a test that the sender's address is not forged. The headers themselves are not sent.
whether the sender is in your address book
the kind you chose for the account, such as Personal or Work, and your note about it, if you wrote one. Never the account's name or address.
your personal context and languages, if you filled them in
your category names and their descriptions

With the Surface depth, that is all. With the Deep depth, the request also contains up to about 2,000 characters of the message text, with quoted replies and signatures removed.

Before sending, Preen replaces card, bank and ID numbers it finds in the subject and text with a placeholder. This is on by default and can be turned off in Settings. It does not catch every way such numbers can be written.

Preen skips encrypted messages, messages that are too large, messages over your daily limit, and messages with no readable text when the depth is Deep.

Your API key goes only to the provider you chose, to sign each request.

What the provider does with your data is set by the provider's own terms. If your provider offers zero data retention, where it deletes your requests after answering, we recommend turning it on. Preen cannot check whether it is on.
What stays on your computer

Preen keeps these in your Thunderbird profile and nowhere else:

Your settings, including your API key. The key is stored unencrypted. It is left out of settings exports unless you choose to include it.
The activity log and your tag corrections, kept for the period you set. You can clear them in Settings.
Monthly totals shown in Settings, Statistics: counts of messages, tokens, cost, tags, errors and similar. They hold no sender, subject or message text.
The debug log, only if you turn on debug mode. It holds the full requests and answers, including message text. You can save it as a file or clear it in Settings, Debug. Nothing from it is sent anywhere.

Preen shows no advertising.
Permissions

Preen asks Thunderbird for permission to read and tag messages, read your accounts and address books, store its settings, add right-click menu items, and run on a schedule. It asks for permission to move mail only when you turn on "Also move it to the Junk folder".
Removing your data

Uninstalling Preen removes its settings, API key, activity log and corrections from Thunderbird. Data already sent to your provider follows that provider's retention policy.
Contact

To ask a question or make a request, open an issue at https://github.com/JR91387/Preen-AI-email-sorting/issues.

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Thunderbird 부가 기능에 오신것을 환영합니다.

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Preen 0.0.29

제작: Jerry

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버전 0.0.29 11월 10, 2026에 출시 217.6 KiB 작동 버전 Thunderbird 140.0 이상

부가 기능

Thunderbird 부가 기능에 오신것을 환영합니다.

시작해 볼까요?

Preen 0.0.29

제작: Jerry

부가 기능 정보

개발자 코멘트

버전 정보

버전 0.0.29 11월 10, 2026에 출시 217.6 KiB 작동 버전 Thunderbird 140.0 이상

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