Admin panel:

All these features are included in site settings menu. You can control whether email should be sent or not, enable/disable attachments, define your custom attachment types etc.

Site Settings.
Email Settings.
Ticket Settings.
Attachment Settings.
Admin can view voting report for technician.
Admin can set send emails.

Admin can add/edit and view technicians, can define permissions like admin panel access ,cross technicians tickets support, assign categories etc.

News:
you can post news from admin panel based on permission news can be viewed by technician/users.

Knowledge base:
you can create unlimited knowledge base with categories and articles.

Technician Panel:
View news
Based on permission set by Admin technician has complete control over tickets.
Send/view private message to/from other technicians.
Based on permission set by Admin tech can add/edit/view user details, can validate New users and send emails.
Can set notifications for their privacy.
Can upload picture.
Can add/edit/view faq entries

User Panel:
Users have complete control over their tickets.
Users can upload their picture
Can view news.
Can search/view knowledge base.
C an vote the ticket message.