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## Internal Domains

- The Internal Domain settings synchronize with the accepted domains in Exchange server during ScanMail installation. This information will not update after installation completes. Trend Micro recommends synchronizing the corresponding settings when the Exchange server updates its accepted domain settings.
- ScanMail allows the usage of the asterisk (*) wildcard to specify internal domains. If you want to bypass a domain and its child domains, use the wildcard as a prefix to the parent domain. For example, if you want to bypass `smex.com`, `child1.smex.com`, and `child2.smex.com`, type the following:
  `*.smex.com`
  However, if you want to bypass a domain but still scan its child domains, type the following:
  `smex.com`