Users of the Internet need to exercise caution when filling out information forms. Giving out your e-mail address may seem like a safe thing to do, but with commerce growing on the Internet, so is the presence of junk mail.
Some sites sell e-mail addresses to junk mailers.
If the recipient has a quota on their incoming mail, receiving large quantities of junk mail can send them over their limit. Also, many people are new to the Internet, and receiving extraneous mail can be overwhelming and intimidating. There are some methods of avoiding junk mail and of removing yourself from junk mailing lists. This can be a good indicator that the site sells e-mail addresses received in such a manner. You are entitled to control what sort of e-mail you receive.