We have a plan of using a single department. All our clients which use this department to create tickets.

There are multiple teams who would be handling the tickets. 

a) All agents belonging to the department gets an email notification. Some may be relevant to them and some may not be. 

b) if their are 5 clients and each sending an 10 tickets a day to a particular department. How is it handled?

Does it not become cumbersome?

c) All users of a particular account ( Client A) should be able to see tickets created by the other users belonging to same account). This doesnot seem to happen.

I am looking to forward to suggestion how is such a situation handled. If there are other users who have such a business requirement.