Suppress connection exceptions

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

@@ -2182,6 +2182,11 @@ class Core {
                             ex.getCause() instanceof ConnectionException))
                 recoverable = false;
 
+            if (ex instanceof ConnectionException)
+                // failed to create new store connection
+                // BYE, Socket is closed
+                recoverable = false;
+
             if (ex instanceof FolderClosedException ||
                     ex instanceof FolderNotFoundException)
                 recoverable = false;

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

@@ -59,6 +59,7 @@ import androidx.lifecycle.LifecycleOwner;
 import androidx.preference.PreferenceManager;
 
 import com.google.android.material.bottomnavigation.BottomNavigationView;
+import com.sun.mail.iap.ConnectionException;
 
 import java.io.BufferedInputStream;
 import java.io.BufferedOutputStream;
@@ -398,6 +399,9 @@ public class Helper {
                     ex.getCause() instanceof MessageRemovedException)
                 return null;
 
+            if (ex instanceof ConnectionException)
+                return null;
+
             if (ex instanceof FolderClosedException)
                 return null;