10 Minute Mail comes in handy when you register an account somewhere and they demand your address to send you a confirmation link for you to click on to activate your new account. But why not use it here as well - you don't even get to design the address yourself so no risk of giving anything away on AB. Ten minutes - plenty of time to receive an email and copy the sender's address to your desktop NotePad. And as you can see you are able to demand more time if you need to.
http://10minutemail.com/10MinuteMail/
There are hundreds of other services similar to 10 Minutes and with a longer time limit but I've heard good things about this one. Haven't used it myself but it should work, should it not. Once you've established contact you can give it all away and Spare will be none the wiser;) And this way you won't be getting AnswerBank into possible legal trouble.