Script Object Function Email Verification

This form uses a script object to hold a function that runs the email verification code. I haven't yet figured out why the the value of EMAILADDRESS is undefined. I want the textfield1 to equal empty (not the word, but a blank space) if the email address doesn't match "@testdomain.com". Any ideas? Thanks.

https://workspaces.acrobat.com/?d=wZR1nYuqo*IRbQEypEsbow

Greg