Syntax & Format Validation
RFC-compliant format checking catches malformed addresses, typos, and invalid characters before deeper checks begin.
Verify Any Address
Email Verification Service
Verify any email address in seconds with multi-layered DNS, MX, and SMTP checks. Detect invalid, disposable, and risky addresses before they damage your sender reputation.
Free DNS check — no signup required. Sign up for full SMTP verification with 5,000 free credits.
Multi-Layered Checks
How Our Email Verification Works
Every email address passes through six verification layers to deliver 98.4% accuracy.
Domain & DNS Verification
Confirms the domain exists, resolves properly, and is not parked or inactive — filtering out addresses that can never receive mail.
MX Record Lookup
Queries mail exchange records to verify the domain has active mail servers configured and ready to accept messages.
Disposable Email Detection
Identifies temporary and disposable email services that create throw-away addresses — protecting list quality and engagement rates.
Role-Based Address Filtering
Flags generic role addresses (info@, admin@, support@) that typically have lower engagement and higher complaint rates.
SMTP Mailbox Confirmation
When enabled, connects to the recipient mail server to confirm the specific mailbox exists — without sending any email message.
Complete Protection
9-Point Email Verification Engine
Every email address runs through all 9 checks. No tiered features — every credit gets the full verification.
1
Syntax Validation
RFC 5322 format check catches typos, missing @, spaces, and invalid characters.
2
Domain DNS Check
Confirms the domain exists and resolves. Detects NXDOMAIN (non-existent domains).
3
MX Record Lookup
Verifies mail exchange records exist and identifies the email provider.
4
SPF Verification
Checks for Sender Policy Framework records that authorize mail servers.
5
DKIM Check
Detects DomainKeys Identified Mail records with auto-selector detection.
6
DMARC Validation
Verifies DMARC policy and reporting configuration for authentication compliance.
7
SMTP Mailbox Verification
Connects to the mail server to confirm the specific mailbox exists — without sending email.
8
Disposable Detection
Checks against 800+ known disposable email providers (Guerrilla Mail, Temp Mail, etc.).
9
Catch-All Detection
Probes with random addresses to detect domains that accept all mail regardless of mailbox existence.
Provider Intelligence
How We Handle Different Email Providers
Not all email providers respond the same way. Our engine adapts verification strategy per provider.
| Provider | SMTP Response | Our Approach |
|---|---|---|
| Gmail / Google Workspace | 250 for all addresses | Classified as "ambiguous" — DNS checks applied, mailbox unconfirmed |
| Microsoft 365 / Outlook | 250 for all addresses | Same ambiguous treatment with domain health factored in |
| Yahoo / AOL | 550 for invalid, aggressive rate limiting | Throttled probing with automatic retry and backoff |
| ProtonMail | 250 for all addresses | DNS-only mode — mailbox unconfirmable |
| Self-hosted (Postfix, Exim) | 550 for invalid users | Full SMTP verification with greylisting retry (up to 3 attempts) |
Learn more: SMTP Response Codes Explained
98.4%
Verification Accuracy
9
Verification Checks
1-3s
Per Verification
800+
Disposable Providers Detected
Verification Modes
DNS-Only vs Full SMTP Verification
Choose the right verification depth for your needs.
| Feature | DNS-Only | Full SMTP |
|---|---|---|
| Syntax check | ✓ | ✓ |
| Domain / DNS check | ✓ | ✓ |
| MX record lookup | ✓ | ✓ |
| SPF / DKIM / DMARC | ✓ | ✓ |
| Disposable detection | ✓ | ✓ |
| SMTP mailbox confirmation | ✗ | ✓ |
| Catch-all detection | ✗ | ✓ |
| Greylisting retry | ✗ | ✓ |
| Accuracy | ~80% | 98.4% |
| Availability | Free tool | Free account |
Clear Outcomes
Email Verification Results You Can Trust
Every verified address is categorized into one of four clear outcome statuses.
Valid
Address exists, domain is active, and the mailbox can receive messages.
Risky
Address may be valid but carries risk — catch-all domain, role-based, or disposable.
Invalid
Address does not exist, domain has no mail server, or syntax is malformed.
Unknown
Server did not respond conclusively. The address may or may not be valid.
Use Cases
Email Verification Use Cases
Pre-Campaign List Cleaning
Verify your entire email list before every send with the bulk email verifier. Remove invalid and risky addresses to reduce hard bounces, protect sender reputation, and maximize inbox placement rates.
CRM Data Hygiene
Keep your CRM clean with regular verification. Identify stale addresses, detect disposable signups, and maintain trustworthy data for automation workflows and reporting.
Registration Form Validation
Validate email addresses at the point of capture. Block disposable and invalid addresses before they enter your database.
Lead Qualification
Score and filter inbound leads by email quality. Prioritize verified business emails and flag risky or role-based addresses that indicate low conversion potential.
256-bit SSL Encrypted
No Emails Sent During Verification
No Data Reselling — Ever
98.4% Accuracy Rate
Frequently Asked Questions
What does email verification check?
Mailthentic checks syntax formatting, domain existence, MX record availability, disposable email databases, role-based address patterns, and optionally SMTP mailbox existence — all without sending any email.
How fast is the verification process?
Single email verification typically completes in 1–3 seconds. Bulk verification processes thousands of emails per minute with parallel processing.
Does verification send emails to the addresses being checked?
No. Mailthentic never sends emails to addresses on your list. DNS and MX checks are passive lookups. SMTP verification connects to the server but does not deliver any message.
What is the difference between DNS-only and SMTP verification?
DNS-only validation checks domain existence, MX records, and SPF/DMARC configuration. SMTP verification goes further by connecting to the mail server to confirm the specific mailbox exists, providing higher accuracy.
How accurate is email verification?
Mailthentic achieves 98.4% accuracy with full SMTP verification. DNS-only checks provide approximately 80% accuracy. Some providers like Gmail and Microsoft 365 always return "accepted" — these are classified as ambiguous providers and handled with additional heuristics.
What is catch-all detection?
Catch-all domains accept email for any address, even non-existent ones. Mailthentic detects these by probing with random addresses — if both accept, the domain is catch-all. Results are classified as "risky" because individual mailbox existence cannot be confirmed.
How much does email verification cost?
Mailthentic offers 5,000 free verification credits on signup — no credit card required. Pay-as-you-go credit packs start at $9.99 for 500 verifications. Credits never expire, and all 9 checks are included in every credit. See full pricing.
Can I verify emails in bulk?
Yes. Upload a CSV file with thousands of email addresses to our bulk verifier. Mailthentic processes them in parallel with auto-deduplication, real-time progress tracking, and segmented CSV/Excel export by result status.
Can I integrate verification into my app?
Yes. Our REST API lets you verify emails in real time from any application. Simple JSON endpoints, API key authentication, and webhook support. Integrate in minutes.
Explore More
Related Email Verification Tools
Bulk Email Verifier
Upload CSV files and clean entire contact lists with parallel processing and real-time tracking.
DNS Email Validation
Validate MX records, SPF, and DMARC configuration without SMTP connections for fast domain-level checks.
Domain Health Check
Audit your domain's email authentication setup including SPF, DKIM, and DMARC policy configuration.
Provider-Specific Verification Guides
Start Verifying Email Addresses Today
Create a free account and verify your first emails in seconds. No credit card required.