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I have used this plugin several times on sites that I have built, and have been very pleased with it. As I have never needed anything more than a simple contact form, I have always opted for the free version.
However I have recently been receiving spam or junk enquiries on a site I have built (all of which originate from the same 2 or 3 IP addresses). If an automated programme is sending these enquiries, it seems to be able to deal with the two digit verification process without any trouble.
Is there any way that I can block or black list these IP addresses, or can anyone suggest a plugin that will do this for me?