You can view all the mails that are related or are bound by a parent mail. When you forward/reply to a mail, that mail is considered as a related mail of the original mail.
1. Select the mail whose related mails you wish to view.
2. Click on the ‘Related Mails’ button.
3. This will display the following dialog.
3. Please note that a mail can have multiple related mails. The original mail is highlighted.
4. You can click on the Subject of any of the related mails to open that mail.