We get a good number of form fill outs from people who do not fill out their complete email address (such as leaving out the .com)
Is there a way to not allow users to submit a form unless email address is complete?
<mailbox@domain>, where domain only has one part, is potentially a valid email address. It's not incomplete.
You can read more about this in the post
No, sandy@gmail isn’t an “incomplete” e-mail address!
as well as JS to deploy if you want to be stricter than the true standard.