Blanket update email for commits in a repo

git-author-rewrite.sh

#!/bin/sh

git filter-branch --env-filter '

CORRECT_EMAIL="mail@jaybe.net"

export GIT_COMMITTER_EMAIL="$CORRECT_EMAIL"
export GIT_AUTHOR_EMAIL="$CORRECT_EMAIL"

' --tag-name-filter cat -- --branches --tags

• clone new copy of repo
• run script in new repo dir
• git push --force --tags origin 'refs/heads/*'
• delete old repo and re-clone

https://help.github.com/articles/changing-author-info/