How to tracking email open

Hi thanhtien19,

To track how many employees open an email sent to all employees in Microsoft 365, you can use the following methods:

Method 1: Use read receipts

To use read receipts, you need to enable them in your Outlook settings. Once enabled, you can request a read receipt for any email you send.

To do this, click the Options tab in the New Message window and check the Request a delivery receipt box.

Once you have sent the email, you will receive a notification when each recipient opens it. The notification will include the recipient's name and the time they opened the email.

Method 2: Use Microsoft 365 message trace

Microsoft 365 message trace is a tool that allows you to track the status of email messages sent and received by your organization. To use message trace, you need to have an Exchange Online administrator account.

To track email opens using message trace, follow these steps:

1. Go to the Microsoft 365 Defender portal (https://admin.exchange.microsoft.com/).
2. Click Mail flow > Message trace > Start a trace
3. You can define the sender E-mail and the recipient E-mail and the time range.
4. Click Search.

The message trace results will show you the status of all email messages that match your search criteria. The message trace will show you whether the email was opened, read, or deleted.