Yoheim secures your data with asymmetric key cryptography, In which it is mandatory for the receiver to have a public key in order to be shared with them, so the user who do not exist on yoheim platform will be first invited to download the app via email. Once they downloads and sign up, you will receive an email saying that the user has accepted invite and has joined the team, post that you can share server directly with them using the share option available in the context menu of server card.