As this article:
notes, there are some great ways of getting your email box full. There are job opportunity sites or freelance job websites that offer to send you information for free. These job sites consider themselves to be opportunities for you to get a good online job. The problem however does not arise with getting you to give them your email address but is what they do with it. These job sites at times sell your information. You end up getting emails from the site but also emails that you didn't sign up for. Of course, there are the others that try to sell you things from these emails such as job information and so on.
You have to be careful when signing up to get this information. Sometimes the emails are quite valuable but when they start trying to sell you the same thing repeatedly, it might be time to stop submitting your email and to press the unsubscribe button listed in the letter.
