# Spam filter

> Adds a Postbox filter that sorts spam into its own folder, and now and then a real letter too.

## Prerequisites

It is a root of the Security track. Nothing comes before it.

## Facts

Spam filter
- **Track:** Security
- **Era:** [Pre-seed](https://wiki.playquorum.dev/eras/pre-seed.md)
- **Cost:** 150 150
- **Requires:** —

## See also

- [Research tree](https://wiki.playquorum.dev/research.md)

Source: https://wiki.playquorum.dev/research/spam-filter