The extension is for creating email templates and managing them in a website dashboard. You can create email templates with CRUD module in your backend or Gii generator. Version 4.0.0 chages are:
- Improved extension architecture
- Changed minimum Yii version from ^2.0.0 to ^2.0.13
- Fixed a bug with
yii\base\Objecton PHP 7.2
- Removed unused composer packages from dependencies
- Other minor improvements and fixes
All changes are avaliable in changelog file.