GMail Cleaner is a small app that cleans the newsletters in your GMail, based on Google OAuth and GMail Search API.
You can easily set your own server on Heroku.
git clone https://github.com/cllu/GMailCleaner.git
heroku init
heroku set:config GOOGLE_CLIENT_ID XXXXXXXXX
heroku set:config GOOGLE_CLIENT_SECRET XXXXXXXX
git push heroku master
Apache 2