What are the differences between WorldPosta® and the other services?

WorldPosta
Zoho Mail
CPanel
Go Daddy
Gmail business
On-premise
Cost
2$
8$
Cheap
6$
10$
High costs to setup + running and maintaining costs.
Storage
200 GB / User
100 GB / User
Avg: 200 MB/ User
5 GB / user
30 GB / User
Limited by used servers capacity
attachment
35 MB / Message
30 MB / Message
Max: 15 MB / Message
20 MB / Message
25 MB/ Message
Set by admins
High Service Availability SLA
Mobile App
Extra fees to develop a mobile app
Calendar share
Extra fees
Messages subject tracking
Extra fees
Deleted mail recovery
Only by support
Only by Admin
Pre-backup required.
Mail monitoring
Mail Approval
Global Access Book
Advanced search
Control Panel
Easy and advanced options
Normal
Poor
Normal
Normal
Complicated
Spam and Malware Protection
Basic
Extra Fees
Synchronization
Pre-set required
Archiving
Pre-set required
Support Email Clients (POP3 & IMAP)
Outlook Auto-discover
Migration fees
ZERO
Small fees to zero fees
Extra Fees
Extra Fees
Extra Fees
Extra Fees
Sales Support 24/7
Technical Support (24/7)
Slow
Extra fees
slow