Custom email when Defect life cycle

[Garden16]

I would like to  create a custom email notification whenever the defect is

1: Developer clicks on Create sub-task to create a new defect

1a: Defect is Assigned to the developer or Reassigned to another developer

2: Open defect transition to open the  defect 

3: Developer clicks on Open defect transition to open the  defect 

4:: Developer clicks on Fix defect transition to fix the defect 

5: Developer clicks on Closed  defect transition to close the defect

6: Developer clicks on Reject  defect transition to Reject the defect

7: The developer is forced to add comments using the comments required validator on transition screen  and I would like to  display the comments added by the developer during transitioning the email

The feilds 

This defect is create for Sprint - sprint ID (How do I get  sprint ID) 

Issue key (Defect Subtask ID): 

Issue Summary :

Issue Description:

Assignee:

(Custom field) QA tester: 

Reporter: 

(Custom field)Defect logged Date:

(Custom field) -Defect closed Date:

(Custom field)Rejection Reason drop: Reason for Rejection selected from rejection drop down.

 Defect Status :

 (Custom field)Defect Severity:

 (Custom field) Defect Priority: 

 Resolution:

 Sprint ID: 

  Issue type:  User story (display associated User Story)

 Comments: Comments made by the developer on the Comments field during Transition on the transition screen