Is User Action Message and User Greeting Messages impactful if no data shown and to redirect to settings page?

1. Which mail flow rule component should you use to define what to do with a message that matches a specified condition?
2. How to tell which transport rule was applied to an email message?
3. Which file or files are monitored by endpoint DLP?
4. What is exchange transport rule?

Which mail flow rule component should you use to define what to do with a message that matches a specified condition?

If you need to match one condition or another, use separate rules for each condition. For example, if you want to add the same disclaimer to messages with attachments and messages that contain specific text, create one rule for each condition. In the EAC, you can easily copy a rule.

How to tell which transport rule was applied to an email message?

to find which transport rule was applied to a specific message, Get-MessageTrackingLog returned no RuleID in EventData - Microsoft Q&A.

Which file or files are monitored by endpoint DLP?

Endpoint DLP supports monitoring of these file types through policy: Word files. PowerPoint files. Excel files.

What is exchange transport rule?

Transport rules are similar to the Inbox rules that are available in Outlook and Outlook Web App. The main difference is transport rules take action on messages while they're in transit, and not after the message is delivered to the mailbox.