they are only agreeing to receive information about that product email list or service specifically. Set Expectations - It is always a good idea to properly set the expectations as to what your subscriber will be receiving. Let them know email list what they will be receiving and how often they will be receiving it. Provide an example on your website of the emails that they will receive email list from you. This lets the subscriber know what they can expect and the value they will receive. Build Your Own Lists -
DO NOT buy or rent third-party lists, or email list use a list that was derived from some other site with permission specific only to that site. Just because it's "opt-in" doesn't mean it's your opt-in. DON'T pre-check the opt-in box to email list add subscribers to your list - Instead let the user check the box indicating that they want your emails. Confirmed Opt-in - Consider a confirm/double opt-in signup process.