You can log in to Sandstorm using any email address.<p>Eventually, we plan to support logging in using a PGP key.<p>We see &quot;internal user stores&quot; (e.g. basic username&#x2F;password with no connected email address) as problematic because a major design goal of Sandstorm is the ability to move data between hosts easily. Say you and five friends have been using Rocket.Chat on Sandstorm Oasis, and then you decide to transfer it to a self-hosted Sandstorm server -- or vice versa. It would be nice if after moving, Rocket.Chat can still recognize your five friends and being the same people, so that you don&#x27;t lose your PM history and such. This is only possible by using some form of federated identities which all Sandstorm servers can independently authenticate. Username&#x2F;password is inherently per-server so doesn&#x27;t provide that.