GhostMail offered military encrypted and self-destructing email accounts Protonmail PRO users will be refunded and contacted directly. GhostMail has no way of perusing its customers encrypted conversations it wouldnt know who would be up to no good, and who wouldn’t. The company might be able to offer a more focused offering for enterprise customers. If you are a GhostMail user make sure to download any messages from its servers that you wish to keep before 1st September.”]
Source: https://grahamcluley.com/secure-email-service-ghostmail-shutting-fear-abused/