Email verification for WordPress forms. Block disposable, block spam, block invalid email, block free email and role-based email.
As of April 2026, MailboxValidator Email Validator is a WordPress email filter plugin with 20 active installations and a 1/5 rating from 1 reviews. It has been downloaded 10K+ times in total. Requires WordPress false+ and PHP false+. Available on WordPress.org since 2019. Top alternative: String Replacer.
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!
| WordPress | false+ requiredTested up to 6.9.4 |
| PHP | false+ required |
Plugin data sourced from WordPress.org. Analysis and metrics by PluginSift.