In order to maximize the deliverability of your emails and to prospect in accordance with the RGPD (cf. Understand GPDR -french article-), on Datananas Outbound :
1. Go to your Sequences, in the Settings tab
2. In the Unsubscribe section, enable the option "Include an unsubscribe link at the end of each email" and save
If your contacts decide to click on the unsubscribe link, they will automatically be unsubscribed of the current sequence and cannot be added other sequences anymore.