Although GitHub removed the private messaging feature, there's still an alternative.
GitHub host git repositories. If the user you're willing to communicate with has ever committed some code, there are good chances you may reach your goal. Indeed, within each commit is stored some information about the author of the change or the one who accepted it.
Provided you're really dying to exchange with user user_test
- Display the public activity page of the user:
https://github.com/user_test?tab=activity - Search for an event stating "user_test pushed to [branch] at
[repository]". There are usually good chances, he may have pushed one
of his own commits. Ensure this is the case by clicking on the "View
comparison..." link and make sure the user is listed as one of the
committers. - Clone on your local machine the repository he pushed to:
git clone https://github.com/..../repository.git - Go to that directory
cd repository - Checkout the branch he pushed to:
git checkout [branch] - Display the latest commits:
git log -50
As a committer/author, an email should be displayed along with the commit data.
Note: Every warning related to unsolicited email should apply there. Do not spam.