Adobe Campaign allows you to create and manage newsletters and cross-channel communications, through a set of services: messages can only be sent to profiles who subscribed to the service (opt-in). These profiles are identified using a dedicated filter when creating a message.
Subscription mechanisms can be set up to offer your customers a chance to subscribe to these services, notably though emails and landing pages.
Subscriptions can also be managed using the Adobe Campaign Standard API. For more on this, refer to the dedicated documentation .