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## About Internal Domains

Configure your company’s internal domains to distinguish them from outgoing mail traffic. Data Loss Prevention policies will disregard email messages that transmit through your internal domains according to the policy configurations. When Data Loss Prevention policies apply to outgoing mail only, no policy violations trigger for the internal domains.
ScanMail allows the usage of the asterisk (*) wildcard to specify internal domains. In order to use the wildcard operator, the following rules apply:

- The asterisk placement is at the beginning of the domain name.
- The asterisk precedes a period (.).

#### Wildcard Examples

Valid Wildcard Examples: | Invalid Wildcard Examples:
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*.smex.com *.yourcompany.com | *smex.com smex.*.com smex.*

Related information

- Configuring Internal Domains