How to prevent editing original incoming mail in Outlook

Hi Techies and MVP,

Question is How to prevent editing the outlook incoming mail?.

Here are the steps to editing the original incoming mail...

1. open any outlook incoming mail

2. choose action and click edit message and save

3. Now verify the same incoming mail which is with the modified content.

I don't know whether it is an application bug?

This option should not be in the Outlook application.

Appreciate your earliest reply to prevent such edit action.

Thanks

Alagar