Last run before field study build

• Logging
• Key import
• Feedback function
• Password in keychain
• Upload all mails decrypted or export private Key on mailserver (after study)
• Warning/Notification to invite one (e.g. most frequently used, iOS user, random ....)
• Remove testaccounts and Public keys
• Add import public keys
• Review Providers.json (are all folder paths up to date? Do we missed some important provider out? Do we give detailed setup-instructions on the website? Is every provider working?)