Gnanaprakash Rathinam : Community Add-On Developer

Clearout Email Validator plugin seamlessly integrates with Gravity forms to validate the email addresses in real-time. The plugin will perform 20+ refined real-time validation checks to determine the current status of the email address. The validation will ensure the email address capture process to –

Accept only valid email addresses
Accept business/work email address only
Prevent all fraudulent signups from temporary/disposable/throw away email addresses
Block free email address provider like gmail.com / yahoo.com / hotmail.com, in case you want to
Remind genuine users of their email if there are some typos.