Within each policy type, each policy must have unique matching criteria. ZixGateway cannot apply two different policies of the same type to a single email. This does not mean that the email can not match two different policies within the same policy type. See Policy Reduction for the steps taken to resolve email that matches two policies in the same policy type.
The matching criteria consists of the To, From, and the combination of the Subject, Body, and Attachments fields. At least one of these values must be different than the other policies of the same type.
For example, suppose you define two policies with the following matching criteria:
To: Enable All Patterns
From: Enable All Patterns
Subject OR Body: HIPAA (standard)
To: Enable All Patterns
From: Enable All Patterns
Subject AND Body: HIPAA (standard)
These two policies are different because the combination of Subject, Body, and Attachments is different. However, any email that matches Policy B will also match Policy A. In that case, the policy defines how, or if, the message is sent to the recipient.