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② 後台搜尋「BillionVerify Email Validator」→ 直接安裝（推薦）
原文外掛簡介
BillionVerify Email Validator checks email addresses in real time as your forms are submitted, stopping fake, mistyped, disposable and undeliverable emails before they reach your database. Cleaner signups mean fewer bounces, less spam and healthier email campaigns.
The plugin verifies each address against the BillionVerify API — performing syntax, MX and SMTP mailbox checks — and rejects the submission when the address matches a status you have chosen to block.
Key features
Real-time verification during form submission (no front-end changes required).
Detects valid, invalid, disposable, catch-all, role and risky addresses.
Choose exactly which statuses block a submission — invalid only by default.
Custom error message shown to visitors.
Built-in connection test and single-email test tool in the admin.
Result caching to save credits on repeated addresses.
Fail-open by default: if the API is unreachable or credits run out, forms keep working.
Supported forms
Default WordPress registration form (including multisite signup)
WordPress comment form
WordPress lost-password form
WooCommerce checkout and account registration
Contact Form 7
WPForms
Gravity Forms
Elementor Pro Forms
Fluent Forms
Third-Party Service Usage
This plugin sends email addresses to the BillionVerify API (https://billionverify.com/) for verification. Through API calls to BillionVerify servers it verifies email addresses and retrieves account credit information, using the following endpoints:
Verify an email address: https://api.billionverify.com/v1/verify/single
Retrieve credit balance: https://api.billionverify.com/v1/credits
By installing and activating this plugin, you consent to the transmission of submitted email addresses to these URLs for the purpose of verification. Use of the BillionVerify service is subject to BillionVerify’s Terms of Service (https://billionverify.com/terms) and Privacy Policy (https://billionverify.com/privacy).
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