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
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.