How does the Temporary e-mail work ?
Such as : http://10minutemail.com
There is a hamster running in a cage whenever a temporary email is created.
Just kidding :) (though maybe it's true :)
Actually, they have an email server with a program to process catch-all email address, which means all the emails come to their *@10minutemail.com will go through that program. Then, the program will filter & show you emails come to a specific email address, for example: a2492048@10minutemail.com when you go to their website.