Hi Duy Bao VN1,
According to your description, I use JS script to implement verification email address.

Below is the JS code:
function validateEmail(execuationContext)
{
var formContext = execuationContext.getFormContext();
var fromEmailAddress = formContext.getAttribute("msdyncrm_fromemail").getValue();
console.log(fromEmailAddress);
var mailformat = /^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/;
if(fromEmailAddress.match(mailformat))
{
alert("Valid email address!");
}
else
{
alert("Invalid email address!");
}
}
Find this field and add this JS code in the Events tab. Save and publish.


Here are the test results:

