The new mass messages feature in DJ-Messages helps to send messages to large groups of recipients at once. It can be a Joomla User Group or/and more selected recipients at once.
TL;DR for this update:
Mass messaging can be used by the administrator of the website to inform the chosen users or a group of users about any events or any news. Having the option to send messages to the whole group of users is a real time saver and can help to manage the website for the administrator. Combining this feature with the option of reporting who read the message makes it easy to ensure all recipients read the messages.
On the other hand, users can communicate with a larger audience sending the same message to selected recipients.
The new option is available at the "Send a message" view, which can be found in the DJ-Messages component view in the frontend and in the website's backend (for administrators).
Users can send a message to multiple users at the same time.
Simply select users in the "Recipient" box and create a message to them. (Each user can decide whenever his profile is visible here and available for others to be communicated).
The administrator can choose a Joomla user group from the list of existing groups on the website and send your message to users belonging to a chosen group.
Both new options can be combined. It means that the Super User can choose recipients and a Joomla user group, which will increase the number of recipients, and both options are not mutually exclusive.