Opt-in
Yes, in the Netherlands it is mandatory to provide an opt-in as well as an opt-out option. This means you need explicit permission from the recipient to send emails. For commercial e-mails, the subscriber must give unambiguous consent, for example by means of a checkbox on a registration form.
A soft opt-in
There are exceptions, such as soft opt-in. This allows you to send a customer emails without their consent. Among other things, a soft opt-in applies after a purchase. However, the customer must have had the opportunity to opt out of these additional mailings at the time of purchase. An explicit opt-in is also not required for essential information, such as delivery details or payment reminders.
