Verify any email address — before you hit send.
SMTP mailbox checks, catch-all and disposable detection, bulk Excel, and a live API. Protect deliverability with domain health and blacklist monitoring.
Clean lists in the browser, in Excel, through your API workflow, or directly inside WordPress forms. Pay only for definitive valid and invalid outcomes.
Clean lists. Protect forms. Watch your domain health.
Email Validator by N-Software is a list-cleaning and inbox-health tool for marketers, founders, agencies and developers. It checks syntax, DNS and mail-server signals, then returns an honest status instead of pretending every address can be reduced to a simple yes or no.
Use it before a campaign, inside your lead forms, during WooCommerce checkout, in an automation workflow, or over a REST API from your own product.
Built for deliverability, not just format checking
A well-formed address can still be disposable, catch-all, blocked, full, mistyped or connected to a domain with no usable mail route. Email Validator combines multiple signals and preserves uncertainty when a provider does not give a definitive answer.
More than a syntax check.
The platform follows a practical validation flow: normalize the address, inspect the domain and MX records, detect disposable or role patterns, use SMTP signals where appropriate, and return a status your team can act on.
Real SMTP verification
Mailbox-level checks where mail-server behavior allows it — not a fake syntax-only badge.
Domain & MX checks
Confirm that a domain has a usable route for receiving email before deeper validation.
Disposable detection
Identify temporary and throwaway providers that can pollute lead and newsletter lists.
Catch-all awareness
Separate catch-all domains from genuinely confirmed individual mailboxes.
Honest uncertainty
Risky and unknown are preserved when a provider response cannot support a definitive claim.
Typo & role signals
Surface common domain mistakes and role-account patterns before they become bad leads.
What each result means
Mailbox is confirmed by available validation signals. High confidence.
Mailbox or receiving route is definitively rejected. High confidence.
Insufficient confidence for a firm answer; handle according to your list policy.
Domain accepts many or all recipient addresses; not individual mailbox proof.
Mailbox is reported as full. The address may exist but cannot currently receive mail.
No definitive result or a technical failure. Treat separately from invalid addresses.
How validation works
- Paste an address, upload a list, use the API, or validate a WordPress form submission.
- We normalize the address and check syntax, domain signals, MX, disposable patterns and relevant mailbox checks.
- Yahoo/AOL-style domains use the appropriate provider-aware route when required.
- You receive a clear status, confidence and supporting signals for your workflow.
Credit policy: definitive valid and invalid outcomes consume verification credits. Catch-all, risky and unknown outcomes stay free.
Bulk list cleaning, live API and deliverability tools.
Whether you have ten contacts or thousands, the same result model follows your data. Upload a file, call the API, or use the WordPress plugin to prevent poor addresses from entering your system in the first place.
Bulk validation without guesswork
- Upload lists for practical cleanup before a campaign or import.
- Track processing progress and status counts while the job runs.
- Download results with validation data added to your workflow.
- Reuse prior definitive results where appropriate instead of paying twice.
- Keep ambiguous results visible instead of silently marking them invalid.
REST API
Use your X-API-Key in forms, CRMs, internal systems, automation workflows and custom apps.
- Single email verification
- Clear machine-readable status responses
- Confidence and extra signals
- Designed for reusable integrations
Deliverability & domain health
Check the health of your sending domain, not just the recipients on your list.
- SPF, DMARC, DKIM and MX visibility
- Blacklist monitoring and alerts
- Analytics and PDF reports
- Useful before campaigns and during ongoing operations
Use Email Validator where your data already lives
Use the API directly or connect it through the free WordPress plugin. Designed for website forms, WooCommerce, spreadsheets, marketing platforms, CLI workflows and custom integrations.
Stop fake, disposable and dead email addresses before they reach your site.
N-Software Email Validator checks addresses in real time through the free Email Validator API. Protect registration, comments, checkout and form submissions without adding another paid WordPress license.
One API key. The forms you already use.
The plugin is free. Create a free Email Validator account, copy your API key and paste it into Settings. There is no plugin license key, no locked form integration, and no paid add-on inside the plugin.
Registration and comments
Checkout email validation
CF7, WPForms, Gravity, Ninja and more
MC4WP, Mailster and supported forms
Dashboard
Connection status, remaining credits, live activity and Quick Validate for one address.
Settings
API key, green connected indicator, timeout, cache TTL, integration toggles and optional business-email rules.
Bulk Validate
Upload CSV or TXT files with up to 5,000 addresses, review progress and download results.
Logs & Debug
Review recent validation history, confidence, MX details and the source of each check.
Email Health
Scan stored users, customers and comments, pause safely and act on selected results.
Clean uninstall
Optional removal of plugin settings, cache, logs and plugin-created data on deletion.
Safe behavior when a result is not definitive
The plugin blocks invalid and disposable results by default. It permits risky, catch-all, unknown and rate-limited results so real customers are not locked out just because a provider cannot give a firm answer.
Fail-open protection: if the API is unreachable or a temporary network issue occurs, the form is allowed to submit. Your site should not stop collecting leads because an external check is temporarily unavailable.
You can optionally block free consumer providers such as Gmail, Yahoo or Outlook when a workflow requires business-domain addresses only.
New in version 1.3.26: optional data cleanup on deletion
Enable Remove all plugin data when the plugin is deleted if you permanently remove the plugin and want its settings, cached results, logs and plugin-created data deleted too. This action is irreversible; export any records you need before deleting the plugin.
Simple credits, no surprise charge for uncertain outcomes.
Create an account to receive 200 free credits each month after confirming your email. Use the same account with the web app, bulk checks, API and free WordPress plugin.
Verification plan
For recurring workflows, forms, API traffic and regular list checks.
See subscriptionsDomain Health
Unlimited domain health, 15 blacklist monitors and 200 verifications.
Explore monitoringHow credits work
- Definitive valid results
- Definitive invalid results
- Catch-all results
- Risky or unknown results
- Other non-definitive outcomes
Checkout and account access
No credit card is needed to start. Confirm your email to unlock the free allowance, API access and bulk workflows. Paid checkout is handled through Lemon Squeezy.
Create your account, connect your workflow, clean your next list.
You can begin with one live check, a bulk file, an API integration or the free WordPress plugin. The same account connects everything.
Create a free account
Confirm your email and receive 200 free monthly credits with no credit card.
Choose your workflow
Check a single email, upload a list, use the API or install the WordPress plugin.
Act on clear results
Clean bad addresses, review risky records and protect forms before data enters your system.
Install the free WordPress plugin
- Download and activate N-Software Email Validator v1.3.26.
- Create a free account at email-validaton.com and copy your API key.
- Open N-Software Email Validator → Settings and paste the key.
- Wait for the green API Connected indicator.
- Enable the forms and WordPress areas you want to protect.
Yes. The N-Software Email Validator plugin is free and has no separate plugin license key. It uses your free Email Validator API account and its available credits.
Validation pauses until your account has available credits again. The WordPress plugin is designed so forms can still submit rather than showing visitors a quota failure screen.
No. When the API cannot be reached due to a temporary network or service issue, the plugin uses fail-open behavior so the form remains usable.
Yes. Version 1.3.26 includes an optional setting to remove plugin settings, cache, logs and plugin-created data when the plugin is deleted. Enable it only when you want a permanent cleanup.
The dedicated support page covers installation, API keys, form integrations, Bulk Validate, Email Health, logs, cleanup and troubleshooting.
Clean your next list in minutes.
Create an account, make your first check, or install the free WordPress plugin and protect the forms you already use.