E-mail Addresses With Special Characters

I wanted to test some Unicode characters to see if they would sync properly.  So, I made up an e-mail address: üḯǟôÕ@host.com.  The e-mail address synced without any error messages, but when I tried to edit the contact in Gmail I was given the following error: “Please enter a valid email address.”

So, while gContactSync and Thunderbird fully support Unicode, it appears that Google supports Unicode in every field except for email.