The cost of spam is so great and takes up about 66% of emails. Cost of all the spam sent is shown in your bandwidth and sms charges. Your text messages and emails. Spam also takes up time the time you have to sit on your email deleting or moving spam. Content in spam could be taking your information if you let them.
How to avoid
Filters will help organizes important emails to spam. The major thing to do is to never respond to spam.