You never had to enter a real email address (or anything that looked like an email address) on any anonymous FTP server I've ever used. You could usually leave

You never had to enter a real email address (or anything that looked like an email address) on any anonymous FTP server I've ever used. You could usually leave it blank, but if a server really wanted me to enter something and I didn't feel like mashing the keyboard, I would sometimes use the address of the server's administrator or some well-known email address that wasn't mine.