Can Zuhal validate email addresses in real time at the point of capture?

Yes. Zuhal's REST API validates a single email address in under one second on average. Integrate the API into your sign-up form, checkout, or CRM to reject invalid addresses at the point of entry — before they ever enter your database.

Does email validation slow down my sign-up forms?

No. The Zuhal API responds in under 1 second average. For user-facing form validation, implement it asynchronously — validate while the user fills in remaining fields so the result is ready by the time they click submit. This adds zero perceived latency.

Email Validation Service

Email Validation That
Actually Works — 99.5% Accurate

Q: What is the difference between email verification and email validation?

The terms are used interchangeably in the industry. Both refer to the process of confirming that an email address is correctly formatted, exists on a live mail server, and is deliverable. Zuhal performs all layers of validation: syntax check, DNS/MX record lookup, and SMTP handshake confirmation.

Q: What happens with catch-all domains during validation?

Catch-all domains accept email regardless of whether the specific mailbox exists. Zuhal flags these as 'Catch-all' — a separate category from valid and invalid. You decide whether to accept, flag, or suppress them based on your use case and risk tolerance.

Validate email addresses in real-time or in bulk. Multi-layer syntax, DNS, MX, and SMTP checks — all in one platform. Pay per email, not per month.

Start Validating Free → See pricing →

100 free credits · No credit card · No monthly fee

99.5%

Validation Accuracy

< 1s

Real-Time API Response

4 Layers

Validation Checks

2B+

Emails Validated

99.9%

Uptime SLA

How It Works

Four-Layer Validation Engine

Most email checkers stop at syntax. Zuhal goes four layers deep — every check that can be performed without sending an email. This is what 99.5% accuracy requires.

Try It Free — 100 Credits

Syntax Validation Instant

Checks format, special character placement, length limits, and RFC 5322 compliance. Catches typos, malformed addresses, and obvious entry errors before any network call is made.

DNS / MX Record Lookup < 100ms

Queries the domain's DNS records to confirm mail exchange (MX) records exist and are correctly configured. A domain with no MX record cannot receive email — regardless of what the address looks like.

Disposable Domain Check Database

Cross-references the domain against a continuously updated database of 200,000+ known disposable and temporary email providers. Mailinator, Guerrilla Mail, YOPmail, and thousands more are flagged instantly.

SMTP Handshake Verification Deepest Check

Connects to the receiving mail server and simulates delivery — without actually sending an email. Confirms whether the specific mailbox accepts delivery. This is the layer that separates true validation from surface-level checking.

Use Cases

Who Uses Email Validation

Email validation works at different points in your workflow. Zuhal supports all of them.

Bulk List Validation

Upload CSV, TXT, or Excel files. Validate entire lists before importing to your ESP, CRM, or outreach platform. Remove invalid addresses before they cause bounces.

Any list size supported
Real-time progress tracking
Download by result category

Sign-up Form Validation

Integrate the API into your registration form. Reject invalid addresses at the point of capture — before they ever pollute your database or trigger onboarding emails.

Under 1 second response
Zero perceived latency
REST API, simple JSON

CRM Data Hygiene

Validate existing CRM contacts before your next campaign. Remove addresses that have degraded since acquisition. Keep Salesforce, HubSpot, or any CRM clean at all times.

Export from CRM, validate, reimport
Flag degraded contacts
Schedule regular clean cycles

Pre-Campaign Validation

Validate your sending list before every major email campaign. Even active subscribers have a degradation rate of 22–25% per year. One clean cycle prevents campaign damage.

Remove hard bounce risks
Protect sender reputation
Improve inbox placement

Result Categories

Precise Results — Not Just Pass/Fail

Every address gets a specific status code so you know exactly what to do with it.

✓ Valid

Deliverable

Address exists, mailbox accepts delivery, domain has active MX records. Safe to send.

✗ Invalid

Undeliverable

Mailbox does not exist on the server. Sending causes a hard bounce. Remove immediately.

? Catch-all

Cannot Confirm

Domain accepts all email regardless of mailbox existence. Cannot confirm deliverability via SMTP. Use with caution.

⏱ Disposable

Temporary

Known temporary or single-use mailbox. Will not engage after initial registration. Suppress or flag.

💼 Role-based

Shared Inbox

Generic address (info@, support@, admin@). Not a personal inbox — damages engagement and triggers filters.

~ Unknown

Inconclusive

Server did not respond definitively. Rare result — typically caused by server-side greylisting or timeout. Treat conservatively.

Start Validating Email Addresses Today

100 free credits. No credit card. No monthly fee. Validate a sample of your list and see the accuracy yourself.

Get 100 Free Credits →

Transparent Pricing

Pay Per Validation. Never Per Month.

No subscriptions. No minimum commitments. Credits never expire. Volume discounts built in.

10,000 emails

$10

$1.00 per 1,000

Get Started

Email Validation — Common Questions

What is the difference between email verification and email validation?

The terms are used interchangeably in the industry. Both refer to confirming that an email address is correctly formatted, exists on a live mail server, and is deliverable. Zuhal performs all layers of validation: syntax check, DNS/MX record lookup, disposable domain check, and SMTP handshake confirmation.

Can Zuhal validate email addresses in real time on my sign-up form?

Yes. The Zuhal REST API validates a single address in under 1 second average. Call the API asynchronously while the user fills in remaining form fields — the result is ready by the time they click submit. Zero perceived latency for users.

What happens with catch-all domains during validation?

Catch-all domains accept every email address regardless of whether the specific mailbox exists. Zuhal flags these as 'Catch-all' — a separate category from valid and invalid. You control whether to accept, flag, or suppress catch-all addresses based on your use case and risk tolerance.

How is Zuhal's validation accuracy measured at 99.5%?

Accuracy is measured as the percentage of emails marked "Valid" that successfully deliver, and the percentage of emails marked "Invalid" that would bounce. Zuhal's SMTP handshake layer is the critical differentiator — it confirms delivery acceptance on the actual mail server, not just the domain. Start with 100 free credits to verify accuracy on your own list.

Can I use Zuhal to validate emails via API without a monthly plan?

Yes. Full API access — including both real-time single-check and bulk job endpoints — is available on the pay-as-you-go credit model. No monthly plan required. Buy credits when you need them. They never expire.

Validate Your Email Addresses Today

100 free credits. No credit card required. No monthly fee. Four-layer validation — see the accuracy for yourself before committing.

Start Free — 100 Credits →

No credit card required · Pay-as-you-go · Credits never expire

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Email Validation ThatActually Works — 99.5% Accurate