Andy, are you getting this email signature on your computer or on your Android mobile device? If you are facing issue with Gmail on your PC, please follow the steps Go to AVG > Menu > Settings > General > uncheck "Enable AVG email signature" option and save settings.
Andy, thank you for the information. But, we don't have a feature to scan emails on Android device. Have you installed AVG on your PC? what version you have installed? If you installed AVG on your PC, please follow the steps Go to AVG > Menu > Settings > General > uncheck "Enable AVG email signature" option and save settings.