📄️ Private Mailbox
Most customers use a Private Mailbox due to it's combination of security and API access. In addition Private Mailboxes have several advantages over Public: 
📄️ Public Mailbox
The Public Mailinator system (i.e. every possible email address @mailinator.com) creates inboxes when emails arrives for them. All inboxes and emails are in the public domain. They are readable and delete-able by anyone. By design, there is NO privacy in the public Mailinator system. 
📄️ Message Delivery
Mailinator message flow diagram