Scroll downwards and click on “Configure shield setting” and then click “Mail Shield” Step 5 Select “Protection” and click on “Core Shields” Step 4 Open your Avast antivirus software on your computer and click on “Menu” Step 2 If you want to remove Avast email signature from your Gmail, below are the steps to follow: How to remove Avast E-mail signature from Gmail This message is enabled by default by Avast antivirus but can be removed if you want. This virus-free message is to let your recipients know that Avast antivirus software has scanned the email for virus and malware. How to remove Avast E-mail signature from Gmail, Yahoo, Outlook, and AOL : If you use an email client such Gmail, Yahoo, Outlook, or AOL, and you have Avast antivirus installed on your computer, Avast antivirus will include a Virus-free message similar to an email signature at the bottom of your outgoing emails. How to remove Avast E-mail signature from Gmail Yahoo Outlook and AOL