If you have an email account, you’ve probably dealt with the nuicance of spam. Spending time to sort through your email between legitimate emails and spam.
The main reason why SPAM is so difficult to eradicate is that spammers are economically motivated. The cost of sending mass emails are very low at times, free. It is impossible for internet service providers to block all spam. Many tools for fighting spam often block legitimate emails also. As these tools are developed spammers find solutions to bypass their spam filters.
Some things that you can do to lessen the amount of spam that you receive is to mark your email as spam. If you notice that you receive a lot of email from a particular domain for example email@example.com, blocking hotbuys.pl would be your best defense.