Before anyone asks: yes, I have read the chat guide. Yes, I am trying to register a nick.
Trouble is, when I try the NickServ command, it says that my email is not a valid address. Here's the exact response, edited for privacy:
NickServ register [PASSWORD] [@gmail.com]
NickServ [@gmail.com] is not a valid e-mail address.
Any idea why this is happening? I'm using the same eMail I used to register for Wikidot, and I'm using ChatZilla after several difficulties with Mibbit.