Every day, spammer posts two messages to my Message form with a bogus email entry so I can’t email the spammer to get him to stop. How do I block spam messages from this bogus email address?
Email addresses are validated by WordPress, specifically the is_email function, which out of the box only checks that the value meets some basic format requirements for an email address.
There are numerous plugins in the WordPress plugin directory that make use of a filter in that function to perform enhanced email validation: Plugins categorized as email validation | WordPress.org
You can also find some additional anti-spam solutions on the following page of the documentation: Fighting Spam - Gravity Forms Documentation
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