Email Validation & Blocklist - WordPress Plugin

WordPress email validation with blocklists and MX checking - no third-party APIs needed

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Updated Jul 2026 · Added Jul 2026

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What is Email Validation And Blocklist?

Email Validation and Blocklist is a WordPress plugin that manages email validation and blocking directly within WordPress, eliminating reliance on third-party APIs. It validates MX records, maintains customizable blocklists for domains and addresses, and logs validation decisions to reduce bounce rates and unwanted signups. Designed for WordPress site owners and administrators who need granular control over email acceptance and fraud prevention.

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Key Features of Email Validation And Blocklist

Email blocklist for addresses and domains
MX record validation
Monitor-only mode with logging
Strictness control for parsing failures
External list synchronization from remote URLs
Logging of allowed/blocked emails
Multisite network support
WordPress constants configuration
Expandable via hooks
Default action control (Pro)
Email address validation rules (Pro)
Multiple list source syncing (Pro)

Who Should Use Email Validation And Blocklist?

Reduce bounce rates on email signups

Prevent spam and unwanted user registrations

Manage whitelisted email domains for membership sites

Block known malicious email domains

Monitor email validation without enforcement

Sync blocklists across multiple WordPress sites

Email Validation And Blocklist: Pros & Cons

✓Pros

No third-party API dependency or charges
Works with lists containing 250k+ domains on shared hosting
Fully independent configuration per site on multisite networks
Monitor-only mode to assess effectiveness before enforcement
Logging capabilities for audit trails
Extensible with custom hooks
Constants-based configuration for security

✕Cons

Pro features required for default action control and email address validation rules
Pro features required for multiple list syncing
Performance may vary depending on hosting environment

Frequently Asked Questions about Email Validation And Blocklist

Does Email Validation and Blocklist require API keys or external services?

No. The plugin performs MX record validation and blocklist checking entirely within WordPress, with no reliance on third-party APIs or services. This means no additional charges, no rate limits, and no external dependencies to manage.

Can I sync blocklists from multiple sources across a WordPress multisite network?

The free version supports external list synchronization from remote URLs on individual sites. Syncing from multiple list sources across a multisite network requires the Pro version.

What happens if email validation fails to parse correctly?

You control the strictness level, which determines how the plugin handles parsing failures. You can also use monitor-only mode to log validation decisions without actually blocking emails, letting you assess effectiveness before enforcement kicks in.

Can I set a default action for emails that fail validation?

The free version logs validation results but requires the Pro version to control the default action and set custom email address validation rules. Both versions let you maintain blocklists for specific domains and addresses.