Is the Zoho Campaigns default footer theme an organisational or list-specific unsubscribe?
In order for a contact to unsubscribe from your
organisation completely, and thus receive no more emails on any lists, you need to create a new theme and set the unsubscribe
option on the footer to be the organisation.
Go to Settings --> Header and footer --> Add new.
After creating a new header and footer, kindly click on edit and go to footer option and select unsubscribe and change it to organisation.
Once
this change is made, keep this header and footer as default. So that
anyone who unsubscribe in the future will be unsubscribing from the
organisation instead of a mailing list.