It is exactly the same. In fact: - Opt-out: user has to take action to NOT receive emails - Opt-in: user has to take action to receive emails - Double opt-in

It is exactly the same. In fact: - Opt-out: user has to take action to NOT receive emails - Opt-in: user has to take action to receive emails - Double opt-in: user has to take action AND confirm his/her email address. The double opt-in process ensures that the person who submitted the form on your website is indeed the recipient of the email address. It's not mandatory by law but good practice. These laws exist in the EU to protect the customer. The OPTA has the power to make you pay a hefty fine (up to €450,000) for sending spam. Unfortunately, these laws do not apply for business to business relationships. In B2B, your company can still send my company unsollicited emails without breaking the law.