A newsletter is a typical gateway to a long-term customer relationship — the customer voluntarily requests regular information and in return receives offers, news, and useful content. The `/newsletter` module therefore manages a list of all subscribers, regardless of whether they signed up from the web, came via import, or were manually entered by an operator. It separates the signup phase from the confirmation phase, tracks the source of each subscription, and connects with the **Contacts** module as a unified recipient database, as well as with **Newsletter Campaigns**, which execute the mailings themselves. A clean and verified list of subscribers is p...
