> ## Documentation Index
> Fetch the complete documentation index at: https://docs.getinboxzero.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Cold Email Blocker

> Block cold emails and protect your inbox from spam using AI filters.

Cold Email Blocker keeps unsolicited sales pitches and outreach out of your inbox before you ever see them. The AI recognizes cold emails that traditional spam filters miss, while anyone who has emailed you before always gets through.

Open **Cold Email Blocker** in the left sidebar, or visit [Cold Email Blocker](https://www.getinboxzero.com/cold-email-blocker).

## Choose a Mode

You can run the Cold Email Blocker in three modes:

1. **List**: Show detected cold emails in the table on the page without changing your inbox.
2. **Auto label**: Label cold emails in your inbox with `Cold Email`.
3. **Auto archive and label**: Archive cold emails and label them with `Cold Email`.

Cold email detection applies only to new emails as they arrive; it does not reprocess older mail.

## Custom Prompts

Emails are classified using a prompt. The default works for most people, but you can adjust it by clicking **Edit Prompt**. Giving examples of what you do and don't consider a cold email works well.

## Testing

Click **Test** to open a side panel where you can paste in an email or test against previous emails to see if they would be marked as cold.