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② 後台搜尋「Sparrow Email OTP Verification for Contact Form 7」→ 直接安裝（推薦）
原文外掛簡介
Sparrow Email OTP Verification for Contact Form 7 provides a robust security layer for your website by verifying user email addresses before form submission. This effectively blocks bots, spammers, and malicious actors from flooding your inbox with fake data or invalid leads.
Why this plugin is different:
Most existing OTP plugins require you to pay for their proprietary API or use their specific SMTP service to send codes. This often leads to unexpected monthly costs and vendor lock-in.
This plugin is built with a “Your Server, Your Rules” philosophy. It sends OTP codes using the native wp_mail() function, meaning it utilizes your website’s default mail configuration or your preferred SMTP service. There are no extra costs, no hidden fees, and no third-party accounts required.
Features
Block Bots & Spam: Ensure every submission comes from a person with a valid, accessible email address.
Conditional Display (New v1.1.0): Dynamically hide verification elements inside an elegant wrapper box until an email string is typed.
Cost-Effective: Zero cost to send OTPs—it uses your existing server or SMTP setup.
Privacy First: No data is sent to external verification APIs; everything stays on your server.
Smart Detection: Automatically finds the email field in your Contact Form 7 forms.
Security-First Rate Limiting: Built-in protection to prevent OTP request abuse by limiting users to 3 attempts per 5 minutes per IP address.
Lightweight: Minimal footprint to ensure your site remains fast and passes Core Web Vitals.
