Configuration logfiles / ports
Using Norton 360 including firewall on Windows 10, with no mail client (just gmail in the browser). Provider blocked the Internet access, and provided examples with time stamps of spam mail. Scan does not find anything with Norton, nor Malwarebytes.
1) Is the logfile accessible, so I can check whether the PC was active at the relevant spamming time?
2) Port 25 is protected, but it seems it cannot be blocked. Is there any regular use for the port and how to block it completely to avoid the spambot's activity till identified? Somehow SMTP ports with authentication cannot be protected by Norton. Any reason for this?