Follow few simple steps shown as below to disable avast email signature:-

Step 1. First, you have to open your Avast interface to disable avast email signature.

Step 2. Now Double Click on Avast Icon on your window.

Step 3. Now you have to click on the cogwheel icon which is available on the top right corner of avast for go to the settings of avast.

Step 4. Now select the general section in avast.

Step 5. You will see the option “Add a signature to the end of sent email”, now you have to uncheck the option to remove avast email signature.

Step 6. Finally, you have to restart your browser to remove avast email signature.