change first view when reading a mail

enzevalos_iphone/SwiftUI/Read/ReadModel.swift

@@ -36,13 +36,17 @@ enum ReadPart {
 
 class ReadModel <M: DisplayMail>: ObservableObject {
     @Published var dismissView = false
-    @Published var currentTab = ReadPart.Security.value
+    @Published var currentTab = ReadPart.Body.value
     
     private var userAction:  UserAction?
     var mail: M
     
     init(mail: M) {
         self.mail = mail
+        if mail.encryptionState == .UnableToDecrypt ||
+            mail.warnings.count > 0 {
+            currentTab = ReadPart.Security.value
+        }
     }
     
     func onDisappear() {