How do I configure the appropriate Git hook to send a summary email whenever a set of changes is pushed to the upstream repository?
Here is the simplest solution I've found:
1) Log in to your gitHub account on github.com
2) In the main tab click on Settings
3) From the main navigation choose Service Hooks
4) From Available Hooks choose Email
5) Fill in your email address in field Address
6) Check the checkbox Send from Author
7) Check the checkbox Active
8) Click on Update Settings
Optional: You can click on Test Hook for testing, check your inbox you should receive email.
Also there are images made according to the process:




And now for the grand final I have the answer which is tested and approved at my side.
How to send email to ALL development team members, when gitHub's Service Hooks->Email allows only at most 2 recipients }.
The answer is combination of Service Hook->Email @ GitHub && Google groups