For instance on this website I offer Free Traffic Tips to all those that sign up for my newsletter. This allows me to send out emails to everyone on my list periodically. You may offer a free report, or a free e-book - just make sure that is has value. Not only should the free offer, offer some type of value to your customer but so should your messages you send out to their email boxes after they sign up.
If you try to sell them something during every email you'll never be increasing web site traffic to your web site because they'll be un subscribing to your newsletter left and right. The key is to treat your newsletter signs up the way you'd want to be treated, email list with respect and with value rich content. Step#3. Setup your opt in email newsletter to go on autopilot that will send a new message out every so often (as many days apart as you'd like). Or if you'd rather just type new messages and not have it on auto that is fine as well you just want to stay in contact with your list every week or
Just be sure not to over do it by sending them an email every day unless you offered them a course that needs to go out daily. Again irritating them will just leave no other option but un subscribing by hundreds of your list members , which would prove rather ineffective when trying to increase web site traffic. This is probably the easiest way to get traffic on a weekly basis.