Turning Security Logging On or Off would not affect the PHP Info viewer. Turn Security Logging back On and check the PHP Info viewer tool. What probably happened is that your IP address was not whitelisted yet on your first access attempt for the PHP Info viewer tool.
My guess would be that the emails are being flagged as spam by something such as Spam Assassin installed on your web host. Or maybe there is a problem with how you are doing email forwarding. Can’t really offer any other suggestions. This is probably something you will need to contact your web host about.