JBA CRM version 0.12.1 has a plugin for the Joomla newsletter-component Acymailing.
Like JBA CRM the Acymailing Joomla application operates directly from the website and therefore it is very easy to send newsletters with website content.

It's important for your business to send newsletters to your customers and to check if a customer is subscribed to the newsletter.
Because of the integration between Acymailing and JBA CRM it is possible to save a lot of time