MailboxValidator Email Validator
Email verification for WordPress forms. Block disposable, block spam, block invalid email, block free email and role-based email.
Use with caution
MailboxValidator Email Validator works, but test it on a staging site before relying on it in 2026. It runs on 10+ sites, is rated 1/5 and was last updated 1 month ago, and scores 45/100 on our health check.
- Small user base (10+ active installs)
- Very few reviews so far
- Only tested up to WordPress 6.9 (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 MailboxValidator Email Vali… stands todayWordPress.org search rankings
Live position in the plugin search, top 100| Keyword | Position |
|---|---|
| email checker | #80 |
| email filter | >100 |
| email validation | >100 |
| email verify | >100 |
| form validation | >100 |
Version adoption
Share of active sites per release.
Rating breakdown
★★★★★★★★★★ 1 from 1 reviews
About MailboxValidator Email Validator
From the official readme · v1.7.4Description
This email validation plugin helps you to block disposable email, free email, invalid email or role-based email from using your services or input form.
It helps to block spam, temporary emails and invalid email address messing around your site. You don’t have to master the hard part of adding shortcode into page source to use this plugin, but to activate, configure and you’re ready to prevent all spam signups from invalid email addresses.
You can sign up for a free API key at mailboxvalidator.com, that will allow you to validate up to 300 emails every month for free!
Supported Plugins
- Contact Form 7
- MailChimp
- Formidable forms
- WooCommerce
- JetPack comments and contact form
- Profile Builder
- Ultimate Member registration form
- Users Ultra registration form
- Theme My Login
- WP-Members
- Paid Membership Pro
- Visual Form Builder
- Easy Digital Downloads registration form
- and other plugins that yet come under our radar
Key Features
- Accurate email verification result
- Block invalid email.
- Block disposable email.
- Block free email.
- Block role email.
- Support domain blacklisting.
This email verification plugin needs a MailboxValidator API key to work. You can get a free API from MailboxValidator.
Installation
Installation using WordPress dashboard
- Select Plugins -> Add New.
- Search for “MailboxValidator Email Validator”.
- Click on Install Now to install the plugin.
- Click on Activate button to activate the plugin.
- Get your MailboxValidator API key before start using the plugin.
- Configure the plugin settings, including your API key, domain blacklist and switch on or off the valid, disposable and free and role-based email validator, and design custom error messages.
Manual Installation
- Upload the plugin files to the
/wp-content/plugins/mailboxvalidatoremail-validatordirectory. - Activate the plugin through the ‘Plugins’ screen in WordPress
- Get your MailboxValidator API key through here.
- Configure the plugin settings, including your API key, domain blacklist and switch on or off the valid, disposable, free and role-based email validator, and design custom error messages.
Frequently asked questions
How can this plugin help to validate form details?
This plugin will validate those email and make sure that it is valid or not belong to disposable, free email or role-based. In other words, it will reject those email which is invalid, disposable or free email, depends on your settings.
What is role-based email address?
A role-based email address is the email address that front part like admin@, sales@, support@ and so on.
Do I need an API key to use this plugin?
Yes. You can sign up for a FREE API key from MailboxValidator to use this plugin.
Unable to find your answer here?
Send us email at support@mailboxvalidator.com
Changelog
Added block role-based email address feature.
1.7.4
- Tested up to WordPress 7.1.
1.7.3
- Tested up to WordPress 7.0.
1.7.2
- Fixed PHP warning for undefined array key.
1.7.1
- Tested up to WordPress 6.9.
1.7.0
- Added is suppressed validation and trusted domain whitelisting features.
1.6.5
- Tested up to WordPress 6.8.
Screenshots
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 MailboxValidator Email Valida… alternatives
All email checker plugins →
FAQ
MailboxValidator Email Validator: quick answers
Straight answers, pulled from live WordPress.org data.
Live data from WordPress.org · checked Oct 5, 2026
Is MailboxValidator Email Validator free?
Yes. MailboxValidator Email Validator is free to download and use from the official WordPress.org plugin directory.
Is MailboxValidator Email Validator safe to use in 2026?
MailboxValidator Email Validator works, but test it on a staging site before relying on it in 2026. It runs on 10+ sites, is rated 1/5 and was last updated 1 month ago, and scores 45/100 on our health check.
How many websites use MailboxValidator Email Validator?
MailboxValidator Email Validator is active on 10+ WordPress websites and has been downloaded 11,401 times since it launched in April 2019. It was downloaded 208 times in the last 30 days.
Does MailboxValidator Email Validator work with WordPress 7.1?
MailboxValidator Email Validator is officially tested up to WordPress 6.9.9, while the latest release is 7.1.2. It may still work, but try it on a staging site first.
When was MailboxValidator Email Validator last updated?
The latest version, 1.7.4, was released on September 1, 2026 (1 month ago).
Who makes MailboxValidator Email Validator?
MailboxValidator Email Validator is developed and maintained by MailboxValidator.
What are the best alternatives to MailboxValidator Email Validator?
The most popular alternatives to MailboxValidator Email Validator are ZeroBounce Email Verificati… (900+ installs), Antideo Email Validator (800+ installs) and Clearout Email Validator (500+ installs).
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