error message: email invalid

I have set up a form for a client and I received this query from her today and not sure how to proceed -

"We have had notification from a client saying that she was unable to send a repeat prescription order through our website?

She said that it kept saying error and also email invalid?

The client's name is Thomson with Chloe."

Many thanks for your help with this

Kind regards

Arielle

This message appears when there was a spelling mistake in the email field:

Here the email should be support@jotform.com for example.

Wonderful. Thank you for such a helpful and quick reply!

Kind regards

Arielle