Like using forums, joining mailings lists can be an extremely great source of traffic to your website.
Now this type of mailing list is not referring to using a mailing list that your prospective or actual customers join on your website, and that you then mail out to on a regular basis (including the use of auto-responders) as this has been covered in detail in the mailing list and auto-responder chapters.
Rather this is where you join someone else’s mailing list...