A simple script to rewrite your commit email address. Use it at your own risk

gitemail.sh

#!/bin/bash
# simple script to change commit email address
# Change the values as per your use case
# After cloning this or downloading this
# Navigate to the directory
#  run: `chmod u+x gitemail.sh` to make it executable
# copy the script in your intended repository
# run ./gitemail.sh and wait for the magic to happen
# I'm not responsible for any unintended consenquences 
git filter-branch --force --env-filter '
OLD_EMAIL="the email you want to change"
CORRECT_NAME="Prefferred username"
CORRECT_EMAIL="Preffered email"
if [ "$GIT_COMMITTER_EMAIL" = "$OLD_EMAIL" ]
then
export GIT_COMMITTER_NAME="$CORRECT_NAME"
export GIT_COMMITTER_EMAIL="$CORRECT_EMAIL"
fi
if [ "$GIT_AUTHOR_EMAIL" = "$OLD_EMAIL" ]
then
export GIT_AUTHOR_NAME="$CORRECT_NAME"
export GIT_AUTHOR_EMAIL="$CORRECT_EMAIL"
fi
' --tag-name-filter cat -- --branches --tags

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

# Author: https://github.com/BILLthebuilder