Do I have to ask contacts to confirm subscription?

We do recommend using confirmation email to improve campaign results, deliverability and to keep your list clean. However, you have the ability to disable confirmation emails for import or contacts subscribing via web form and e-mail. The instructions on this can be found here.

You can also request single opt-in settings for API subscriptions, to do that please email our Compliance team: and provide them answers to questions listed here.