Spam

To opt-out: First, make sure the email is a CAN-SPAM compliant email. Some emails offer opt-outs, but the opt-outs are fake. A CAN-SPAM compliant email will be labeled as an advertisement, will include a valid postal address for the sender, and will include a workable opt-out link of some type. If all three elements are present, then the opt-out is probably valid; however, you will have to use your own judgment about each email. Transactional emails are not required to offer an opt-out. For example, if you place an online order with an Internet merchant, the message confirming your order, informing you of the shipping date, etc., need not offer an opt-out. However, if you get a message a month later announcing a sale, that commercial email should include an opt-out.

More information about CAN SPAM: FTC CAN SPAM page.