Sync time of sent messages

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

@@ -1356,8 +1356,15 @@ class Core {
                         dup.uid = uid;
                         dup.msgid = msgid;
                         dup.thread = thread;
+
                         if (dup.size == null)
                             dup.size = helper.getSize();
+
+                        if (EntityFolder.OUTBOX.equals(dfolder.type)) {
+                            dup.received = helper.getReceived();
+                            dup.sent = helper.getSent();
+                        }
+
                         dup.error = null;
 
                         message = dup;