Trend Micro Email Security scans outgoing email messages before delivery if outbound filtering is enabled. Trend Micro Email Security applies the following policies for filtering:
  • Malware (viruses, spyware, and so on)
  • Spam and phishing
  • Web reputation
  • Data Loss Prevention (DLP)
  • Transport Layer Security (TLS) check
  • DomainKeys Identified Mail (DKIM) signing
In addition, outbound encryption is seamlessly integrated with the content-filtering capabilities of Trend Micro Email Security, using policy-based encryption to secure email messages. The service does not automatically encrypt email messages. When outbound filtering is enabled, outbound encryption appears as a policy option within the Trend Micro Email Security administrator console. You will need to configure rules that apply encryption as a rule action.
To learn about the policy rule used to encrypt outbound messages, see Encrypting Outbound Messages. To learn more about how to enable outbound protection for a managed domain, see step 5 in Adding a Domain.
Trend Micro Email Security evaluates outgoing messages against regulatory compliance templates defined in DLP policies to prevent data leakage. For details about DLP, see Data Loss Prevention.