InboxKitten - Open-source disposable email
git clone "https://github.com/uilicious/inboxkitten.git" cd inboxkitten ./config.sh ./build.sh firebase login ./deploy/firebase/deploy.sh
NOTE: This does require the use of mailgun. I am unsure of their privacy measures.
I have yet to see an open-source release for this, this is dcfinitely something that can cover a large use-case.