---
title: HashBL
url: 'https://docs.danami.com/warden/user-guide/antispam-plugins/hashbl'
markdown: 'https://docs.danami.com/warden/user-guide/antispam-plugins/hashbl.md'
date: '2026-10-02'
description: 'This plugin was introduced in Spamassassin 3.4.2. This plugin supports queries against hashed and unhashed DNS blocklists, such as the msbl.org Email Blocklist (EBL). The EBL contains email addresses used to receive responses to spam emails, which are sometimes called contact email addres…'
taxonomy:
  category:
    - docs
  tag:
    - hashbl
---

[](#)  [ Basics ](https://docs.danami.com/warden/)     [ User Guide ](https://docs.danami.com/warden/user-guide)     [ Anti-spam Plugins ](https://docs.danami.com/warden/user-guide/antispam-plugins)      HashBL    

# HashBL

> > > > > This plugin was introduced in Spamassassin 3.4.2.

This plugin supports queries against hashed and unhashed DNS blocklists, such as the [msbl.org](http://msbl.org) Email Blocklist (EBL). The EBL contains email addresses used to receive responses to spam emails, which are sometimes called contact email addresses or drop boxes.

## How it works

It searches the email addresses found in the message - from the From: headers, the Reply-To header, and the message body - against the EBL using RHSBL-style lookups, and fires the `HASHBL_EMAIL` rule when one of them is listed.

## Rules

| Area | Rule name | Description | Default scores |
|---|---|---|---|
| header | `HASHBL_EMAIL` | Message contains email address found on EBL | 5.0 |

## Settings

This plugin has no additional settings. It can be enabled or disabled under `Warden -> Settings -> Plugin Settings -> HashBL`.

---

## Navigation

- Parent: [Anti-spam Plugins](https://docs.danami.com/warden/user-guide/antispam-plugins.md)
- Previous: [FromNameSpoof](https://docs.danami.com/warden/user-guide/antispam-plugins/fromnamespoof.md)
- Next: [NeuralNetwork](https://docs.danami.com/warden/user-guide/antispam-plugins/neuralnetwork.md)