Hey Swapna,
For this, you can use a regex expression,
in the entity validation tab,
you can use this expression for email validation,
' ^[\w-\.]+@([\w-]+\.)+[\w-]{2,4}$ '
you can refer to the image below for applying this regex,
Hope it helps!
Hi Swapna,
Add a decision to your microflow and set it to condition $object/email=empty if true throw an error message else continue. If you want to check the format of the email id then use ismatch($object/email, regular expression).
reference: https://docs.mendix.com/refguide/string-function-calls/