Microsoft's Outlook.com webmail service already offers a handy option to set up multiple aliases routing to the same address. Now it has an additional useful feature: the ability to create disposable addresses by adding a "+modifier" to the name.
If your address was [email protected], for example, you could create an address in the form [email protected] (Gmail has a similar feature). That makes it easier to filter email used for specific purposes without having to maintain multiple accounts.
Outlook.com supports simpler "+" email aliases too [Within Windows]