DavidR
2
Currently these settings can only be changed in the Mail Shield - so temporarily install the Mail Shield - change the settings - See https://forum.avast.com/index.php?topic=179178.msg1268163#msg1268163
The avast team are likely to duplicate the settings in the Mail and Web Shields for those without the Mail Shield installed.
For now it is either as mentioned above or modifying the EmailShield.ini file and the above is probably the least hassle.