If its a private Server ( not a Microsoft Server -Outlook) then you have to make sure all settings, SSL, Authentication, actual mail server names and...
Actually it isn't / Wasn't a "Secret" , maybe not looking at the right places, Dont have sport so no idea about that side, but Sky do often Announce...
Whats really Ironic is "CCleaner has been hacked twice since Avast acquired it in mid-2017. ' AND they are meant to be a Security Company - Hopeless...