Cannot resend to undisclosed-recipients

FAQ.md

@@ -3419,6 +3419,7 @@ The resend menu item will be shown grayed (dimmed) if the message headers are no
 
 Remarks:
 
+* Messages to, CC or BCC *undisclosed-recipients:* cannot be resend
 * The original subject is sent as-is, unless it is being changed
 * The original message text will be sent as-is, unless text is being entered
 * The original attachments are sent as they are, unless attachments are being added or removed

app/src/main/java/eu/faircode/email/FragmentMessages.java

@@ -238,6 +238,7 @@ import javax.mail.MessageRemovedException;
 import javax.mail.MessagingException;
 import javax.mail.Part;
 import javax.mail.Session;
+import javax.mail.internet.AddressException;
 import javax.mail.internet.InternetAddress;
 import javax.mail.internet.MimeMessage;
 
@@ -2790,6 +2791,15 @@ public class FragmentMessages extends FragmentBase implements SharedPreferences.
                             }
                 }
 
+                boolean canResend = true;
+                for (Address r : recipients) {
+                    String email = ((InternetAddress) r).getAddress();
+                    if ("undisclosed-recipients:".equals(email)) {
+                        canResend = false;
+                        break;
+                    }
+                }
+
                 PopupMenuLifecycle popupMenu = new PopupMenuLifecycle(context, getViewLifecycleOwner(), anchor);
                 popupMenu.inflate(R.menu.popup_reply);
                 popupMenu.getMenu().findItem(R.id.menu_reply_to_all).setVisible(recipients.length > 0);
@@ -2799,6 +2809,7 @@ public class FragmentMessages extends FragmentBase implements SharedPreferences.
                 popupMenu.getMenu().findItem(R.id.menu_reply_hard_bounce).setEnabled(canBounce);
                 popupMenu.getMenu().findItem(R.id.menu_new_message).setVisible(to != null && to.length > 0);
                 popupMenu.getMenu().findItem(R.id.menu_resend).setVisible(experiments);
+                popupMenu.getMenu().findItem(R.id.menu_resend).setEnabled(canResend);
                 popupMenu.getMenu().findItem(R.id.menu_reply_answer).setVisible(answers != 0 || !ActivityBilling.isPro(context));
 
                 popupMenu.getMenu().findItem(R.id.menu_reply_to_sender).setEnabled(message.content);

app/src/main/java/eu/faircode/email/MessageHelper.java

@@ -318,7 +318,8 @@ public class MessageHelper {
             ByteArrayInputStream bis = new ByteArrayInputStream(message.headers.getBytes());
             List<Header> headers = Collections.list(new InternetHeaders(bis).getAllHeaders());
 
-            for (Header header : headers) {
+            for (Header header : headers)
+                try {
                     String name = header.getName();
                     String value = header.getValue();
                     if (name == null || TextUtils.isEmpty(value))
@@ -357,6 +358,8 @@ public class MessageHelper {
                             break;
                         // Resent-Sender (=on behalf of)
                     }
+                } catch (Throwable ex) {
+                    Log.e(ex);
                 }
 
             // The "Resent-Date:" indicates the date and time at which the resent