[Malicious] appears in Email headers

Hello William,
We can understand that you are encountering a pop up in Header of your email. Please provide us the screenshot of the header of your email, so that we can assist you better. To create a screenshot, please use this link http://avgread.me/1aZxsAV .
Thank you.

The word [Malicious] appears in the headers of some of my emails.  Is AVG placing this word there?

Hello William,
We can understand that you are encountering a pop up in Header of your email. Please provide us the screenshot of the header of your email, so that we can assist you better. To create a screenshot, please use this link http://avgread.me/1aZxsAV .
Thank you.

Bill, For your info, just in case that you are unaware, you can post the screenshot here in your topic. Click on 'Answer' & then click on the 'Image' [mountain symbol] & follow the instructions. 
AVG Guru