invalid email address when signing up

I have 2 apps using backendless. They have been working great, but since Tuesday (August 30th) it has been reported that intermittently users trying to register as a uer on the app are getting an invalid email error which is preventing from signing up. They have tried again and still no joy. This has all of a sudden started happening on both apps and has never happened before. Can you think of any reason for this? I don’t seem to be able to reproduce the error. Mike

Hi Mike

We are not able to reproduce the issue as well and we didn’t get such complains from the other users