Gravity Forms Reject Disposable Emails

Install this plugin into any WordPress system with a working Gravity Forms plugin and all known disposable email address hosts will be rejected and fail validation. This only checks the field type « email » and does not require any configuration or special settings. Its global, if its turned on, then its working.

Thanks to adamloving for the initial list: https://gist.github.com/adamloving/4401361

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