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I’ve been trying for a few hours to make this Prevent Duplicates code work ‘in reverse’ – https://cfdbplugin.com/?page_id=904
In other words, instead of checking for duplicates, I have an existing database of email addresses that are allowed senders. Any others should be considered invalid. Logically, it should be a simple matter of finding the right place to change “==” to “!=” in your Prevent Duplicates code, but unfortunately, that’s not the case. How can I make this work?