Send depending on a rule

[Bigthunder]

Hello, how can I make the form NOT send a message if the following rule is met. Last name (1_18) is not the same as first name (1_17)?
Best regards.

[Ally]

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[Bigthunder]

Thank you for your quick response. I integrated the code via plugin, but the form still submits

[Ally]

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[Author]

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