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

# Cisco Email Security Appliance

To add Guardian Mail

1. In your Cisco Email Security Appliance, go to “Mail Policies” -> “HAT Overview”

2. Click on the [*BLACKLIST*](https://abusix.com/glossary/real-time-blocklist/) or *BLOCKED\_LIST* sender group (this depends on which version of the software you are running)

3. Click Edit settings and under the [DNS](https://abusix.com/glossary/domain-name-system/) lists section, add \<APIKEY>.[combined.mail.abusix.zone](http://combined.mail.abusix.zone). Replace \<APIKEY> with “**Your API key”** from your account in [app.abusix.com](http://app.abusix.com).