Content filters are rules that allow Cisco ESA to perform actions on messages based on predefined or custom conditions, such as headers, envelope, body, attachments, etc.

The two primary components of content filters are:

Conditions, which are the criteria that determine whether a message matches a content filter rule or not, such as message size, sender address, attachment type, etc.

Actions, which are the operations that Cisco ESA performs on a message if it matches the conditions of a content filter rule, such as deliver, drop, quarantine, encrypt, etc.

The other options are not primary components of content filters on Cisco ESA.