How complicated answers !! It's easy to get the email adress this way :

• First, find the last commit (or a commit) of the user you want to contact
• Second, run :

_

curl -s 'https://api.github.com/repos/$owner/$project/commits' | jq '.[0] | .commit.author.email'

It will output the email address of the last commiter .

For example, you can this way extract the 15 email of the 15 last commiters of chromium project :

curl -s 'https://api.github.com/repos/chromium/chromium/commits?per_page=15' | jq '.[] | .commit.author.email'

Kind regards

nbanba