Last of my 3 questions is this one fixed now ?:-
in the mail relay settings
in the upstream host list the title says "Upstream hosts/networks" so why won't it let me put the ISP's network in there ?
Tom put :-
-> Known Bug, Fix is tagged for version 7.400.
taken from
https://community.sophos.com/products/unified-threat-management/astaroorg/f/56/t/48450