Tip for using the same email account multiple times on the same website

On Gmail it is possible to use the same email account multiple times on the same website for different accounts. I'm not sure if this works on other email accounts but I do know it works on Gmail. To use the same account for multiple accounts all you need to do is add a plus and a word after your user name. Here's an example: Guest@gmail.com Guest+1@gmail.com Guest+secondary@gmail.com These would all send mail to Guest@gmail.com, but would be recognized as different email accounts on a website.