yahoo mail provides a service Yahoo! AddressGuard, to create and use many of the free Disposable email. it's not fake email kind of thing. you can actually use the same email address for receiving the mails.

How to create?

Go to Mail options -> Spam -> Set up a disposable
or in Yahoo Mail Classic Options -> Mail -> AddressGuard

format: Basename-keyword@yahoo.com

The Basename is the unique ID other different from your Yahoo ID. which should be available for you to use. Basename will be the same in all of your disposable email address which you will create.
keyword will be differ for every new disposable mail address. For instance, if you are creating an address to receive an email newsletter from Widget Designs, your keyword could be "widget" or "widgetdesigns". and then you can set the folder where those mail should be delivered. you can also send mails using this new mail address by checking on "Allow messages to be sent from this address".

when ever you start getting spam through any of your disposable addresses, just delete the address. and can say bye to spam.

How it is more meaning full then using gmail plus sign for filtering spam?

in gmail you have to use your running gmail id and then you concatenate a new keyword with "+" sign. the spammers can split up it easily and can use your running gmail address easily. but in case of yahoo disposable mail address, they can not remove the remaining word after "-" in your mail address. they have to use it full. otherwise you can't receive the mail. so it is much meaning full.

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