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Encrypting outbound messages using Trend Micro Email Security (TMEMS)

    • Updated:
    • 25 Sep 2020
    • Product/Version:
    • Trend Micro Email Security All
    • Platform:
    • N/A

Learn how to set up email encryption for outbound messages. This rule action aims to protect sensitive data in email messages sent by users in your organization.

In most cases, a rule to encrypt email messages will be based on one of the following:

  • Specific senders or recipients of the message (e.g. a rule encrypting all emails sent by Human Resources or Legal department)
  • Specific content in the message body
  • Sensitive data contained in the message

Setting up a keyword expression

The keyword expression would act as a trigger or criteria for Email Security to determine whether to encrypt the email.

  1. Go to Administration > Policy Objects > Keywords and Expressions.

    Keywords and Expressions

  2. Click the Add button to create the keyword expression(s).

    Click Add

  3. In the pop-up window, configure the following:
    1. Set Match to Any Specified.
    2. Add keywords or phrases of your choice, or you can also use a regular expression.

    Add expression

  4. Click Save.

Creating a policy for email encryption

  1. Go to Outbound Protection > Content Filtering.

    Content Filtering

  2. Click Add to create a new rule.
  3. Indicate the name of the rule. You may also describe the purpose of the rule in the Note field.

    Add rule name and description

  4. Specify the intended recipients and senders.
  5. On the Scanning Criteria, choose any of the following options where to use the keyword expression that you have created:
    If you intend to encrypt outgoing messages from a specific group, you may skip this step and proceed to Step 6.
    • Subject matches
    • Body matches
    • Attachment content matches

    Content matches

    Once you have chosen the option, click the underlined Keyword Expression and select the policy object you have created earlier and then click Save.

    Select policy object

  6. Under the Action settings, configure the following:
    1. In the Intercept section, select Do not intercept messages.
    2. In the Modify section, enable Encrypt email checkbox.

    Action Settings

  7. Click Submit.
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