Pluto mail, unsend your emails

Pluto mail allows you to unsend or edit an email. It also allows automatic expiration and tracking email opening. The service works on Apple Mail, Iphone and Ipad, Android, Outlook, Hotmail, Thunderbird and Gmail.  The service is free. Presently demand has caused backlog but you can put your name on a waiting list. There are some 4,000 ahead of me at the time of this writing. I imagine it is a matter of server space.

https://www.sendpluto.com/?r=FzOUj