Follow these steps to add a new rule using the Web UI:
In the Web UI, choose Settings > Advanced Rules.
Click Create. The Create New Rule dialog box appears.
In the Rule Name box, type a name for the rule.
Click the Type drop-down list and select the type of rule.
Click the Operation drop-down list and select the required operation.
In the Value box, enter the value to be matched.
Note
Use + to combine the criteria with a Boolean operation.
Click the Actions drop-down list and select whether to allow or block the rule policy. Click Create Rule. The rule is created and displayed in the custom rules page.
Usage guidelines for configuring advanced rules
Follow these usage guidelines when you are configuring advanced rules:
The operations "==" and "!=" will perform an exact match of the specified value.
The "MATCHES" operation supports regular expressions and works based on regex matches. The value provided for the "MATCHES" operation will be considered as a regular expression.
For example, to check for email attachments with a .pdf extension, the following regular expression can be used: \.pdf$