Update the email linked to your previous commit after changing your email address.

update-email.sh

#!/bin/bash

set -e

username=""
new_email=""
repos=(
    # Add the list of repos here
)
old_emails=(
    # Add the list of old emails here
)

for repo in "${repos[@]}"
do
    git clone "git@github.com:${username}/${repo}.git"
    cd "${repo}"

    for old_email in "${old_emails[@]}"
    do
        git filter-branch --env-filter "
            if [ \"\$GIT_COMMITTER_EMAIL\" = \"${old_email}\" ]
            then
                export GIT_COMMITTER_EMAIL=\"${new_email}\"
            fi
            if [ \"\$GIT_AUTHOR_EMAIL\" = \"${old_email}\" ]
            then
                export GIT_AUTHOR_EMAIL=\"${new_email}\"
            fi
        " -f --tag-name-filter cat -- --branches --tags
    done

    git push --force --tags origin 'refs/heads/*'

    cd ..
    rm -rf "${repo}"
done