Revert "Less restrictive can bounce"

This reverts commit 80fb65cf40.

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

@@ -3933,6 +3933,12 @@ public class FragmentMessages extends FragmentBase
                             canBounce = false;
                             break;
                         }
+                    if (canBounce)
+                        for (Address recipient : recipients)
+                            if (MessageHelper.equalEmail(recipient, message.return_path[0])) {
+                                canBounce = false;
+                                break;
+                            }
                 }
 
                 boolean canResend = message.content;