How To Unsubscribe From Email Lists
If you notice that you get multiple emails from a particular email address, it might be in your best interest to skim them before deleting, to determine the best way to effectively unsubscribe. Some places might want you to go to their website, while others simply ask that your reply to that or another email address. Luckily, every spam message is required to list this information, so unsubscribing should always be your first potion.
If you unsubscribe from an email list, and still continue to receive messages, or get a message that does not have a note about unsubscribing, you may want to take further action, and often the best way to do this is to lookup an email address online.
Reporting an email address is a very real option for emails that fall into this later category, or those that otherwise break ethical boundaries, but before you can do this, you have to know a little about the real origin of the message. Since you cannot rely on the header alone, since this information can be spoofed, you will probably need to lookup an email address to take further action against spam email.

