Once again people prefer free software and I agree with you with this one. I explain how why you need a spam blocker software but also another method that requires no software at all.
I used to recommend Gmail, from Google which does not require any anti spam software. I still recommend it cause it is very professional. If you use Gmail you do not need any spam blocker software. I receive at least 15 emails a day and my spam folder is full of spam, but my Inbox perfectly spam free.
Gmail has powerful filters that automatically move spam to the spam folder. With a click Gmail deletes all spam messages or trash messages. My tests results show that Gmail is very good at moving spam to its spam folder. I tested Yahoo mail, Hotmail, Mailup and Adpost.
However if you use Outlook or for any other reason you cannot get a Gmail than I do suggest a spam blocker.
Do you know what a spam blocker is and what it does?
Nowadays everyone receives spam, which are emails from unknown sources. These spam may also contain viruses sometimes. Viruses most often are inserted in attachments so never open any attachments inside email that come from people you do not personally know.
To avoid spam the spam blocker software have special features that identify spam and move it to the spam folder. Different spam software have different methods of blocking spam and identify spam. Gmail is so powerful that it already contains the special spam blocker software included.
Pay attention to whom you give your email address. Do not open attachments. Treat your email address as if it is very important and confidential. Finally I suggest you get a spam blocker software.