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Preen

Preen is an add-on for Thunderbird. It helps sort your mail.

For each message, Preen asks an AI model what kind of mail it is. Then it adds a tag in Thunderbird. The tags are Real person, Needs reply and Junk. Preen also sorts mail into categories, such as Personal, Work, Bills and Codes. You can add your own categories too.

Why people use it

• You stay in charge. The AI gives a score. Your settings turn the score into a tag. When Preen is not sure, it does less, not more.
• You use your own key. Preen sends your mail to OpenRouter or TypeSafe with your own API key. It does not go through a Preen server. Preen sends no usage statistics. See Privacy and data.
• It is safe to try. Right-click a message and choose Preview with Preen (no changes). Preen shows what it would do and changes nothing.
• You can undo. Changes can be undone. Daily limits cap how much mail Preen sorts.

Who it is for

You use Thunderbird 140 or newer. You get a lot of mail. You want help finding the mail that matters.

You need an API key from OpenRouter or TypeSafe. Getting an API key shows how. Preen is an early release (version 0.0.29).

Start here

1. Installing
2. Getting an API key
3. Getting started
4. Settings: every option, one by one
5. Tags and categories
6. Privacy and data
7. Costs and limits
8. Troubleshooting and the FAQ

For developers

• Development
• Architecture
• Releasing

Who made it

Preen was conceived, written and managed by Jerry Reinitz. He worked in partnership with large language models from Anthropic (Claude).

Licence

Preen uses the PolyForm Shield License 1.0.0. You may use it for any purpose, including at work. You may not use it to offer a product or service that competes with Preen. It is source-available. It is not open source.