Email Verifier

Verify email addresses for deliverability — check syntax, MX records, disposable domains, role-based addresses, free providers, and SMTP mailbox existence.

What is Email Verifier?

A fast, free email verification tool that checks whether email addresses are valid and deliverable. No external paid APIs are used — all verification is performed locally using DNS lookups, SMTP handshakes, and built-in databases of 55,000+ disposable domains.

Perfect for cleaning email lists, validating sign-up forms, and reducing bounce rates before sending campaigns.

What data can you extract?

Verification results per email:

• Verdict: valid, invalid, risky, disposable, or unknown
• Confidence score (0-100)
• Detailed checks: syntax, MX record, SMTP, disposable, role-based, free provider, catch-all
• Primary MX server hostname
• Human-readable reason for non-valid results

Input

Email Addresses

Provide a list of email addresses to verify.

{
    "emails": ["user@example.com", "test@gmail.com", "info@company.org"]
}

Verification Depth

Choose how thoroughly each email is checked:

Depth	Checks Performed	Speed	Use Case
Basic	Syntax + MX records	Fastest	Quick format validation
Standard (default)	+ Disposable, role-based, free provider detection	Fast	Email list cleaning
Deep	+ SMTP mailbox verification, catch-all detection	Slower	Maximum accuracy

Options

Field	Type	Default	Description
emails	string[]	—	Email addresses to verify (required)
verificationDepth	string	"standard"	Verification depth: basic, standard, or deep
concurrency	integer	10	Parallel verifications (1-50)

Output

Each item in the dataset represents one verified email:

{
    "email": "test@gmail.com",
    "verdict": "valid",
    "confidence": 85,
    "checks": {
        "syntax": true,
        "mxRecord": true,
        "smtp": null,
        "disposable": false,
        "roleBased": false,
        "freeProvider": true,
        "catchAll": null
    },
    "mxHost": "gmail-smtp-in.l.google.com",
    "reason": null,
    "verifiedAt": "2025-03-16T12:00:00.000000+00:00"
}

Output Fields

Field	Type	Description
email	string	Normalized email address
verdict	string	Verification result: valid, invalid, risky, disposable, or unknown
confidence	integer	Confidence score from 0 to 100
checks	object	Detailed check results (see below)
mxHost	string/null	Primary MX server hostname
reason	string/null	Human-readable explanation for non-valid verdicts
verifiedAt	string	ISO 8601 timestamp of verification

Check Details

Check	Type	Description
syntax	boolean	Email follows RFC 5322 format
mxRecord	boolean	Domain has valid MX records
smtp	boolean/null	SMTP server accepts the address (deep mode only)
disposable	boolean/null	Domain is a known disposable email provider (standard/deep)
roleBased	boolean/null	Address is role-based like admin@, info@, support@ (standard/deep)
freeProvider	boolean/null	Domain is a free email provider like Gmail, Yahoo (standard/deep)
catchAll	boolean/null	Domain accepts all addresses (deep mode only)

Verdict Meanings

Verdict	Meaning
valid	Email passed all checks and appears deliverable
invalid	Email failed syntax, MX, or SMTP verification
risky	Email exists but domain is catch-all (accepts any address)
disposable	Email uses a known disposable/temporary domain
unknown	Could not determine deliverability (SMTP blocked or timeout)

How to use

Quick validation

1. Enter email addresses in the Email Addresses field
2. Leave depth as Standard
3. Click Save & Start

Maximum accuracy

1. Enter email addresses
2. Set Verification Depth to Deep
3. Click Save & Start

Deep mode performs SMTP mailbox verification and catch-all detection for the most accurate results.

Large batches

For 100+ emails, increase the Concurrency setting (up to 50) for faster processing. Domain-level caching ensures MX lookups and catch-all checks are only performed once per domain.

Frequently Asked Questions

How accurate is the verification?

Standard depth provides reliable syntax, MX, disposable, and role-based detection. Deep mode adds SMTP verification for the highest accuracy, but some mail servers may block or rate-limit verification attempts from cloud IPs.

Why is Gmail showing as "risky" in deep mode?

Gmail and some other major providers accept all addresses at the SMTP level (catch-all behavior). This means SMTP verification cannot distinguish between real and fake Gmail addresses, so they are marked as "risky" rather than "valid".

What does "unknown" verdict mean?

Unknown means the verifier could not definitively determine if the email is valid or invalid. This typically happens when SMTP servers block the connection, timeout, or return temporary errors.

Does this use any external paid APIs?

No. All verification is performed locally using DNS lookups, SMTP handshakes, and a built-in database of 55,000+ disposable email domains. No proxy or authentication is required.

Can I verify emails in bulk?

Yes. You can verify hundreds of emails in a single run. Use the concurrency setting to control parallel processing speed. Results are pushed in batches for efficient data handling.

What are role-based emails?

Role-based emails are addresses like admin@, info@, support@ that are typically shared by teams rather than belonging to individuals. These are flagged because they often have higher bounce rates and lower engagement.

Is the data accurate for all email providers?

Syntax and MX checks work universally. Disposable detection covers 55,000+ known domains. SMTP verification accuracy varies by provider — some servers always accept (catch-all) or block verification attempts. The confidence score reflects this uncertainty.