Everyone should work hard to keep his computer as safe as possible from spam, pop-ups, and all the other things lurking on the internet. It's always a good idea to learn how to prevent it, and fix it if you need to.
In many cases you may lose customers because of spam. Sometimes your spam blocking technologies will also stop emails from your own customers.
If you are using common email addresses such as email@example.com or firstname.lastname@example.org or email@example.com or firstname.lastname@example.org. Spammers will always target this emails first hoping to reach you.