How to send mails upto 512 MB??

I just came across a site which allows you to send mails with attachments upto 512MB to any mail id.
You dont need to register nor create an account,just upload a file and send it to a mail id.

IMPT: The attachment will be present in the mail server upto 5 days only[:(]
Want to know how this system works??

See the pic...
1. Sender uploads the file.
2. Recipient receives an email, with a link to download it.
3. Recipient downloads file.


Please visit the official site to know more