I would advise you to let the experts do the job instead.
You need to protect your server from hackers, viruses, malware, and other threats that could compromise your data or harm your network. You also need to comply with the laws and regulations regarding the content and services that you host on your server. If you don’t know how to secure your server properly, you could expose yourself to legal liability or cyberattacks.
I would suggest that you censor the spammer's company name in the screen shot. They want to have more exposure and they don't deserve any.