Unable to add e-mail address by pressing Enter

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Steps to reproduce:
1. Go to My - Profile - Emails
2. Type in an e-mail address
3. Press Enter

Expected result:
The e-mail is added and a verification e-mail is sent out

Actual result:
The page is reloaded, but e-mail address is not added to the list.

Other information:
Using Opera 10.00 on Windows Vista 64-bit