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With a MailNull account, you can give a separate temporary email address each time you make a purchase or sign up for a service on the Internet. Mail to the address will be redirected by the MailNull servers to you current email address -- no configuration changes are necessary. You can annotate the address with the URL, account login information, or other comments to help you manage the addresses that you've given out. If you do get spam mail on a certain address, you can disable it with a click of the mouse.
Source (mailnull.com)
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mailnull disposable email