Modern delay-tolerant email

Email is inherently a delay-tolerant application. However, modern email deployments involve online checks used by anti-spam mechanisms, non-standard UA/MS interactions, MFA client authentication and hop-by-hop encryption all of which can be problematic in the face of high delays or disruptions, and perhaps especially at scale. The project here is to analyse how significant delay and disruption, as might be seen in a cislunar network, can affect modern email deployments, to develop an emulation of a mail deployment for such a network and evaluate the effects of delay and disuption on that mail setup.