How to validate Email entered?

Hi ,

I am curenlty working on developing an app where we collect RM email address, however we see users entring dummy id’s https://screenshot.googleplex.com/9StsNMzHo3VazR6. Is their a way that i can restrict users not entring invalid email id?

https://help.appsheet.com/en/articles/961211-valid_if-column-constraint