Title: Mail7 Email Validation Author: denm Published: August 30, 2026 Last modified: August 30, 2026 --- Search plugins ![](https://ps.w.org/mail7-email-validation/assets/banner-772x250.png?rev=3672808) ![](https://ps.w.org/mail7-email-validation/assets/icon-256x256.png?rev=3672808) # Mail7 Email Validation By [denm](https://profiles.wordpress.org/denm/) [Download](https://downloads.wordpress.org/plugin/mail7-email-validation.1.0.0.zip) * [Details](https://wordpress.org/plugins/mail7-email-validation/#description) * [Reviews](https://wordpress.org/plugins/mail7-email-validation/#reviews) * [Installation](https://wordpress.org/plugins/mail7-email-validation/#installation) * [Development](https://wordpress.org/plugins/mail7-email-validation/#developers) [Support](https://wordpress.org/support/plugin/mail7-email-validation/) ## Description Mail7 Email Validation checks email addresses in real time as they are entered, using the [Mail7](https://mail7.net/) API. It stops fake and undeliverable addresses from getting into your user base, comments and form submissions – which means fewer bounces, less spam and cleaner lists. **Three verdicts, not two.** Real mail servers do not always give a straight answer: catch-all domains, greylisting and disposable providers make some addresses genuinely unverifiable. Mail7 returns **Valid**, **Not Valid**, or **Unknown**, and this plugin** does not block Unknown addresses by default**, so you never turn away a real person over an address that simply could not be confirmed. #### What it checks * Syntax / format * Domain MX records (can the domain receive mail at all) * Live SMTP mailbox check * Disposable / temporary address detection #### Where it plugs in * WordPress user registration * Comment author emails * Contact Form 7 email fields * WPForms email fields #### Reliable by default * Results are cached, so the same address is never re-checked (fast, and no wasted API calls). * If the Mail7 API is briefly unreachable, the plugin fails open – your forms keep working, no one is ever locked out by an outage. #### API key Works out of the box on Mail7’s free anonymous tier (rate-limited). For higher volume, paste a Mail7 API key in the settings – get one at [mail7.net](https://mail7.net/). ### External services This plugin sends each submitted email address to the Mail7 API (https://mail7.net/ api/validate-single) to determine whether it is deliverable. Only the email address being validated is sent. See the Mail7 [Privacy Policy](https://mail7.net/privacy-policy.html) and [Terms of Service](https://mail7.net/terms-of-service.html). ## Screenshots [⌊A fake address is caught right in the form: Contact Form 7 submission stopped, the visitor sees exactly which field to fix.⌉⌊A fake address is caught right in the form: Contact Form 7 submission stopped, the visitor sees exactly which field to fix.⌉[ A fake address is caught right in the form: Contact Form 7 submission stopped, the visitor sees exactly which field to fix. [⌊User registration with an undeliverable address is rejected before the account is created.⌉⌊User registration with an undeliverable address is rejected before the account is created.⌉[ User registration with an undeliverable address is rejected before the account is created. [⌊The settings: one optional API key and six switches. Blocking unverifiable (Unknown) addresses is off by default on purpose.⌉⌊The settings: one optional API key and six switches. Blocking unverifiable (Unknown) addresses is off by default on purpose .⌉[ The settings: one optional API key and six switches. Blocking unverifiable (Unknown) addresses is off by default on purpose. ## Installation 1. Upload the plugin to `/wp-content/plugins/`, or install it from the Plugins screen. 2. Activate it. 3. Go to **Settings -> Mail7 Validation** to choose where validation runs and, optionally, add your API key. ## FAQ ### Do I need a paid account? No. It works on the free anonymous tier. A Mail7 API key raises the rate limit and volume. ### Will it block real users? Not for unverifiable addresses. By default only addresses Mail7 reports as **Not Valid** (do not exist / no mail server) are blocked. “Unknown” addresses are allowed. You can optionally block Unknown too, but it is off by default on purpose. ### What happens if Mail7 is down? The plugin fails open: submissions are allowed. Validation never becomes a single point of failure for your forms. ## Reviews There are no reviews for this plugin. ## Contributors & Developers “Mail7 Email Validation” is open source software. The following people have contributed to this plugin. Contributors * [ denm ](https://profiles.wordpress.org/denm/) [Translate “Mail7 Email Validation” into your language.](https://translate.wordpress.org/projects/wp-plugins/mail7-email-validation) ### Interested in development? [Browse the code](https://plugins.trac.wordpress.org/browser/mail7-email-validation/), check out the [SVN repository](https://plugins.svn.wordpress.org/mail7-email-validation/), or subscribe to the [development log](https://plugins.trac.wordpress.org/log/mail7-email-validation/) by [RSS](https://plugins.trac.wordpress.org/log/mail7-email-validation/?limit=100&mode=stop_on_copy&format=rss). ## Changelog #### 1.0.0 * Initial release: registration, comments, Contact Form 7 and WPForms validation with honest Valid / Not Valid / Unknown handling, result caching and fail-open behavior. ## Meta * Version **1.0.0** * Last updated **3 days ago** * Active installations **Fewer than 10** * WordPress version ** 5.0 or higher ** * Tested up to **7.1** * PHP version ** 7.2 or higher ** * Tags * [contact form 7](https://wordpress.org/plugins/tags/contact-form-7/)[email validation](https://wordpress.org/plugins/tags/email-validation/) [email verification](https://wordpress.org/plugins/tags/email-verification/)[registration](https://wordpress.org/plugins/tags/registration/) [spam](https://wordpress.org/plugins/tags/spam/) * [Advanced View](https://wordpress.org/plugins/mail7-email-validation/advanced/) ## Ratings No reviews have been submitted yet. [Your review](https://wordpress.org/support/plugin/mail7-email-validation/reviews/#new-post) [See all reviews](https://wordpress.org/support/plugin/mail7-email-validation/reviews/) ## Contributors * [ denm ](https://profiles.wordpress.org/denm/) ## Support Got something to say? Need help? [View support forum](https://wordpress.org/support/plugin/mail7-email-validation/)