Lethe PHP Newsletter & Mailing System

Features:-
Easy installation
Multi-user system
Multi Language (23 Language Inc.) and Language Editor
Bootstrap 5 supported and responsive
User-specific theme selection (16 Theme Inc.)
WYSIWYG Editor & Drag/Drop Design
API support
Groups: Add / Edit / Remove / Get / List
Subscribers: Add / Edit / Remove / Get / List / Move / Blacklist
Static / dynamic shortcodes
Advanced graphical statistics
File Manager (user-specific file management)
RSS and web view options
Single / Double Sign-On Verification
User permissions (module usage restrictions)
Time zone support
Debug mode
Handover simulation
Cronjob automation and manual cronjob management
Upload limits and file type restrictions
Browser-based campaign submission
Surveys