MailCheck.ai
Prevent disposable email addresses from registering or commenting on your site with MailCheck.ai.
Consider an alternative
MailCheck.ai shows warning signs in 2026 — compare the alternatives below before installing. It runs on 60+ sites, is rated 5/5 and was last updated 2 years ago, and scores 32/100 on our health check.
- Small user base (60+ active installs)
- Very few reviews so far
- No update in 2 years
- Only tested up to WordPress 6.6 (latest is 7.1)
How does it stack up?
Side-by-side on installs, updates, ratings & support
Daily downloads
Download spikes usually follow a new release — each site that auto-updates counts as a download.
Rankings
Where MailCheck.ai stands todayWordPress.org search rankings
Live position in the plugin search, top 100| Keyword | Position |
|---|---|
| disposable email | #74 |
| email validation | >100 |
| security | >100 |
| spam prevention | #92 |
| User Registration | >100 |
Version adoption
Share of active sites per release.
Rating breakdown
★★★★★★★★★★ 5 from 4 reviews
About MailCheck.ai
From the official readme · v1.3.0Description
MailCheck.ai is now UserCheck.com
Please install the new version of this plugin.
MailCheck.ai is a powerful WordPress plugin that prevents disposable or throwaway email addresses from registering or commenting on your site. This helps to protect your site from spam and maintain the quality of your user base.
Key Features
- Automatically checks email addresses against a constantly updated database of disposable email domains
- Works out of the box with no configuration required
- No API key needed
- Caches results for improved performance
- Seamlessly integrates with WordPress registration and comment forms
The plugin uses the API provided by MailCheck.ai, which is constantly updated to include the latest disposable email domains. This ensures your site stays protected against new disposable email providers.
MailCheck.ai is free to use and starts working immediately after installation. No registration or configuration is required.
Installation
- Upload the
mailcheck-aifolder to the/wp-content/plugins/directory - Activate the plugin through the ‘Plugins’ menu in WordPress
- That’s it! Your site is now protected against disposable email addresses.
Frequently asked questions
Does MailCheck.ai require an API key?
No, MailCheck.ai does not require an API key. It works out of the box after installation without any additional configuration.
Is MailCheck.ai compatible with other email validation plugins?
Yes, MailCheck.ai is designed to work seamlessly with other email validation plugins. However, please note that using multiple email validation plugins might cause conflicts or unexpected behavior.
Can I customize the error message displayed to users with disposable email addresses?
Currently, MailCheck.ai does not provide an option to customize the error message. The default WordPress error message for invalid email addresses will be displayed.
How often is the disposable email domain database updated?
The MailCheck.ai API is updated in real-time. Your plugin will always check against the most current database of disposable email domains.
Does this plugin slow down my website?
MailCheck.ai is designed to have minimal impact on your website’s performance. It uses caching to store results for 1 hour, reducing the number of API calls and improving response times.
Changelog
1.2.6
- Update the API endpoint
1.2.5
- Improved code structure and organization
- Enhanced error handling and security checks
- Updated to follow WordPress coding standards
- Improved caching mechanism
- Added compatibility with WordPress 5.2+
- Added minimum PHP version requirement (7.2)
1.2.4
- Update WordPress compatibility
- Rename the cache key
1.2.3
- Improved URL encoding when constructing the request URL
- Added a condition to check the API response code
- Added an expiration time to the API response cache
1.2.0
- Update WordPress compatibility and rebrand from Validator.pizza to MailCheck.ai
1.1.1
- Update WordPress compatibility
For developers
Is this your plugin? Show off the numbers.
Add a live badge to your site, docs or GitHub README. It updates on its own — no account needed.
Best MailCheck.ai alternatives
All disposable email plugins →
FAQ
MailCheck.ai: quick answers
Straight answers, pulled from live WordPress.org data.
Live data from WordPress.org · checked Oct 5, 2026
Is MailCheck.ai free?
Yes. MailCheck.ai is free to download and use from the official WordPress.org plugin directory.
Is MailCheck.ai safe to use in 2026?
MailCheck.ai shows warning signs in 2026 — compare the alternatives below before installing. It runs on 60+ sites, is rated 5/5 and was last updated 2 years ago, and scores 32/100 on our health check.
How many websites use MailCheck.ai?
MailCheck.ai is active on 60+ WordPress websites and has been downloaded 5,305 times since it launched in April 2017. It was downloaded 74 times in the last 30 days.
Does MailCheck.ai work with WordPress 7.1?
MailCheck.ai is officially tested up to WordPress 6.6.9, while the latest release is 7.1.2. It may still work, but try it on a staging site first.
What PHP version does MailCheck.ai need?
MailCheck.ai requires PHP 7.2 or higher. Most hosts run PHP 8.x today, so it works on any modern WordPress hosting.
When was MailCheck.ai last updated?
The latest version, 1.3.0, was released on August 27, 2024 (2 years ago).
Who makes MailCheck.ai?
MailCheck.ai is developed and maintained by tompec.
What are the best alternatives to MailCheck.ai?
The most popular alternatives to MailCheck.ai are Block Temporary Email (400+ installs), DeBounce Email Validator (300+ installs) and QuickEmailVerification (200+ installs).
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