Cannot get rid of spam

I would recommend that the most effective way is to stop it prior to it reaching your Mac. If your mail service provier is Gmail, Yahoo, Microsoft, our any other reasonably large provider, you should use your browser to login to your account via webmail, and then mark those messages as Spam. Once you have tagged the messages as spam (you may need to do this a few times) then similar messages will start to be sent to the spam box automatically. Therefore, your Mail app will never even retrieve them.

In addition, you will be helping others that may be receiving similar spam messages.

I know it's frustrating but unfortionatly you can't track them and it's not worth even thinking about or worrying about the problem. Large ISPs and service providers have lots of talented people working on spam issues for you day and night. So, there is simply nothing that you can do about the occasional spam that does get through (you likely only see far less than 1% of the spam that is addressed to you.

Just be willing to select and delete such email withough even thinking twice about it.

It's unfortionate, but they count on being able to take advantage of a very small fraction of people that receive these messages and don't understand that they are bogus. It costs the spammers very little to actually send them out by the millions and therefore all it takes is a single victim to make it worth their effort.

Glad your temporary spam issue went away.