I need more details that I can't find in their FAQ[1] and it's not all open source yet[2]. My main question is about metadata which you cannot really protect th

I need more details that I can't find in their FAQ[1] and it's not all open source yet[2]. My main question is about metadata which you cannot really protect that well w/ how SMTP works. The second question would be how different this is from PGP/Mailvelope[3] and where the keys are stored for a user (i.e. the "trusting" you are talking about). 1 - https://www.virtru.com/faq/ https://www.virtru.com/faq/ 2 - https://www.virtru.com/blog/virtrus-open-source-strategy/ https://www.virtru.com/blog/virtrus-open-source-strategy/ 3 - https://www.mailvelope.com/ https://www.mailvelope.com/