How to send an email to all registered users of Redmine
To send an email to all users registered in Redmine, publish news in a project to which all users are added as members.
When you publish news in a project, a notification email is sent to the members. If you create a project for publishing news and add all users as members, you can send an email to all members of the project.
Steps
- Create a project for publishing news
Go to "Administration" → "Projects" → "New project", select the "News" module, and click "Create". - Add all users to the project as members
Add them with "New member" in the "Members" tab. - Add news
Go to "News" → "Add news", enter the content that you want to announce, and click "Create".

