Git hook to send email notification on repo changes

Question

How do I configure the appropriate Git hook to send a summary email whenever a set of changes is pushed to the upstream repository?

Answer 1

Not exactly a full answer since it is Github-specific, but if you happen to use Github it is extremely easy to configure "Service Hooks".
For each repository you wish to monitor, enter Settings / Service Hooks.
There are plenty of available integrations, such as Trac, Twitter, Amazon SNS, Jira, Asana, Bugzilla, FogBugz, IRC, Jabber, Pivotal Tracker, Trello and Email....
Simply select email and feed it with a group email address.
We use the email notifications to sync our developers.