Incoming Email Processing -> Dynamics 365

Hi,

What is the real process when incoming email is converted to the email activity in the CRM? My understanding now is from incoming email, CRM will create an email activity and routed it into a queue, and by doing so create a new queueitem. If there is an automated creation rule activated from email to case, the case will be created based on the mapping provided and the Email will be attached to the case, (The case becomes the value in regardingto in Email entity). So to summarize:

1. CRM create Email entity

2. CRM route the Email entity to the queue and create QueueItem Entity

3. (If an automated rule creation existed) CRM will create the case

4. CRM will update the regardingto field in Email

Are the orders of processing correct? Am I missing something?