Sendible will automatically remove the contacts who unsubscribe from your mailing list. To keep a record of these users who have unsubscribed you can export your unsubscribed contacts from a mailing list via the Sendible dashboard.
Navigate to Measure> Download Data> Contacts> Unsubscribed Contacts
You will have the option to export this list in either HTML or CSV format.
Once you have downloaded this list you will then be able to see a full export of any users who have unsubscribed.
We recommend for our users to keep a reference of those users who have unsubscribed so that they are compliant with the new EU GDPR regulations which will be enforced by the EU parliament on the 25th of May 2018. For more information on GDPR click here.