This new service looks like it could have some promise. Encrypting webmail (Gmail, Yahoo, Outlook) easily without requiring both parties to have encryption setup before use is nice. This leads to the option to “recall” an email as well.
Here is a link to LifeHacker.com’s article on the service: http://lifehacker.com/virtru-encrypts-your-email-lets-you-recall-or-see-if-i-1572789184
Or you can jump right to their website here: https://www.virtru.com/