If you transition to Infusionsoft from another email system, you will export lists of contacts from that system so that you can import them into Infusionsoft. When you import a list, you must confirm that you have received prior permission to send email to those contacts. If you do not have permission, the system assigns a "non-marketable" status to the email addresses on the list. If you do have permission, the system assigns a "single opt-in " status for each email address on the list you import. It is a good practice to re-confirm the people with the single opt-in status. This is another layer of protection, ensuring that you get the best deliverability possible and that the people on your list really want to receive your messages. You can create a custom double opt-in link and email to send as a broadcast, or you can use the double opt-in template we provide.