# Bulk Email Verifier Features: CSV, API & Catch-All | MailVeri

> 1M-row bulk CSV/XLSX verification ($59/100K, 1,000 free credits), real-time REST API, 100K+ disposable domain blocker, catch-all detection, and native MCP.

- **Source**: https://mailveri.com/features
- **AI Reference**: https://mailveri.com/llms-full.txt

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Powerful verification engine

A comprehensive suite of verification tools to keep your lists clean and your deliverability rates high.

[Upload Your List – Get 1,000 Free Credits](https://app.mailveri.com/accounts/signup/) · [Compare vs ZeroBounce](https://mailveri.com/compare/mailveri-vs-zerobounce)

Takes less than 30 seconds • No credit card required • Up to 1,000,000 emails/file

Bulk & Real-Time Verification

## Designed for Both Bulk Lists & Real-Time APIs

Whether cleaning massive outreach databases or verifying registrations in real time, MailVeri provides dedicated, transparent interfaces for every workflow.

Up to 1,000,000 Emails / File

### High-Throughput Asynchronous Bulk Verification

Upload files of any size via CSV, Excel, or plain text. Verify 100,000 contacts for $59 ($299 for 1M, down to $0.0002/email at 5M) and keep your campaign bounce rates strictly below 2%.

- **Live Telemetry:** Real-time progress percentage, elapsed metrics, and row count.
- **Segmented Downloads:** Separate files for Valid, Catch-All, and Disposable leads.
- **Cost Efficiency:** Save up to 90% vs legacy verifiers with non-expiring credits.

[Try Bulk Cleaning Free](https://app.mailveri.com/accounts/signup/)

https://app.mailveri.com/queue-veri/

Live Batch Queue

![MailVeri Bulk List Verification queue showing live batch processing and delivery breakdown](https://mailveri.com/images/product/mailveri-bulk-list-verification.png)

https://app.mailveri.com/single-mail/

Real-Time Single Verifier

![MailVeri Single Email Verifier with granular 8-point deliverability inspection checklist](https://mailveri.com/images/product/mailveri-single-email-verifier.png)

Real-Time Response

### Point-of-Capture 8-Point Deliverability Inspection

Stop bad leads before they enter your CRM. Spot-check individual addresses instantly with full diagnostic transparency across syntax, MX routing, and mailbox status.

- **8-Point Checklist:** Syntax, MX, SMTP handshake, Disposable, Catch-All, and Role check.
- **Silent Bounce Defense:** Detect full inboxes and dead mailboxes before sending.
- **Zero Wait:** Real-time synchronous response for signup forms and CRM webhooks.

[Test an Email Instantly](https://app.mailveri.com/accounts/signup/)

## Complete Feature Set

Every tool you need to maintain a clean, deliverable email list

### Bulk Email Verification

Upload and verify up to 1,000,000 emails in a single list. We support CSV, Excel (.xlsx, .xls), and plain text files. Files are processed line by line with automatic format detection.

- Up to 1 million emails per file
- CSV, Excel, and TXT formats
- Automatic column detection
- Progress tracking in real-time

### Real-time API Verification

Instant email verification via our REST API. Perfect for signup forms, lead capture, and real-time validation. Simple HTTP endpoints work with any programming language.

- Low-latency real-time responses
- Works with any language
- Webhook notifications
- Batch API available

### Native MCP AI Server

Verify leads directly inside AI assistants and agentic coding tools via Model Context Protocol (MCP). Built-in support for Claude Desktop, Cursor, and Windsurf.

- Official Model Context Protocol (MCP) server
- Claude Desktop, Cursor & Windsurf
- Zero glue code or middleware needed
- Real-time tool calling for LLMs

### SMTP Verification

Deep mailbox verification using SMTP handshake without sending actual emails. We connect to mail servers to verify the mailbox exists and can receive messages.

- No emails sent ever
- Real-time mailbox check
- Full inbox detection
- SMTP error analysis

### Disposable Email Detection

Catch temporary and fake email addresses before they hurt your sender reputation. We maintain a database of 100,000+ disposable email domains updated daily.

- 100,000+ disposable domains
- Daily database updates
- Custom domain blacklisting
- Forwarding email detection

### Catch-All Domain Detection

Identify risky catch-all domains that accept all emails but may not deliver. These domains can inflate your bounce rates and hurt deliverability.

- Accurate catch-all detection
- Risk scoring for domains
- Configurable handling
- Detailed domain reports

### Role-Based Email Detection

Automatically identify role-based addresses like info@, support@, admin@. These addresses often have lower engagement rates and higher complaint rates.

- Common role patterns detected
- Custom role definitions
- Engagement risk scoring
- Filter or flag options

### Domain & MX Verification

Verify that the email domain exists and has valid MX records configured. Domains without proper MX records cannot receive email.

- DNS lookup verification
- MX record validation
- Domain age checking
- SPF/DKIM analysis

### Syntax & Format Validation

Check email addresses for proper format and syntax before deeper verification. Catch typos, missing @ symbols, and invalid characters instantly.

- RFC 5322 compliant
- Unicode support
- Common typo detection
- Suggestion engine

### Full-Inbox Quota Detection

Detect active mailboxes that have reached 100% storage capacity before they trigger delayed 48-hour SMTP retry bounces.

- Pre-send quota saturation checks
- Prevents delayed 452/552 retry bounces
- Protects sender domain reputation
- Dedicated FULL_INBOX report status

### Universal Lifetime Credits

Never lose the verification credits you buy. Your credits never expire or reset at month-end, with zero forced monthly subscriptions or forfeiture.

- Credits never expire or decay
- No recurring monthly subscription traps
- Volume discounts up to 90%
- 1,000 free credits on registration

### Fast Turnaround & Batch Throughput

Real-time single-email API verification for signup forms and high-throughput parallel batch processing for lists up to 1,000,000 rows.

- Real-time single verification
- High-speed parallel batch queue
- Live progress telemetry
- Webhook callback on completion

### Detailed Reports

Download comprehensive verification reports with status codes, risk scores, and actionable insights. Export in CSV, Excel, or JSON formats.

- Multiple export formats
- Detailed status codes
- Risk categorization
- Historical data retention

### Data Security & Privacy

Your data is encrypted in transit and at rest. We automatically delete uploaded lists after 30 days and never share your data with third parties.

- TLS 1.3 encryption
- GDPR compliant
- 30-day data retention
- No third-party sharing

### Analytics Dashboard

Track your verification history, credit usage, and list quality trends over time. Get insights to improve your email collection practices.

- Usage analytics
- Quality trends
- Credit tracking
- API usage logs

## Verification Status Codes

Understand exactly what each verification result means for your email lists

VALID

Email exists and can receive messages

INVALID

Mailbox does not exist or is disabled

DISPOSABLE

Temporary email that will be deleted

ROLE_ACCOUNT

Role-based email (info@, support@)

CATCH_ALL

Domain accepts all emails but may not deliver

FULL_INBOX

Mailbox is full and cannot receive messages

UNKNOWN

Could not verify - try again later

## Simple API & MCP Integration

Generate instant API keys, copy Model Context Protocol (MCP) configs for Claude Code and Cursor, or integrate via cURL and SDKs in minutes.

https://app.mailveri.com/api-keys/

Developer Hub • MCP Ready

![MailVeri Developer Hub showing API keys management and Model Context Protocol (MCP) server configuration](https://mailveri.com/images/product/mailveri-developer-api-keys.png)

```bash
# Verify a single email (JSON or Form supported)
curl -X POST "https://api.mailveri.com/v1/verify-mail/" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"email": "test@example.com"}'

# Response (returns both email and mail)
{
  "error": 0,
  "message": "Verified test@example.com successfully",
  "status": "VALID",
  "email": "test@example.com",
  "mail": "test@example.com",
  "balance": 999
}
```

[View API Documentation](https://mailveri.com/docs)

## Ready to clean your entire email list?

Upload up to 1,000,000 emails per file. Save 90% vs ZeroBounce with credits that never expire.

[Upload Your List – Start Free with 1,000 Credits](https://app.mailveri.com/accounts/signup/)

Free signup • Instant verification report • CSV, XLSX & TXT supported

Explore: [Pricing ($59 / 100K)](https://mailveri.com/pricing) · [Compare 36 Verifiers →](https://mailveri.com/compare) · [13+ Native Integrations](https://mailveri.com/integrations) · [Free Email Checker](https://mailveri.com/tools/email-checker) · [REST API Reference](https://mailveri.com/docs/api) · [MCP Server for AI](https://mailveri.com/docs/mcp) · [2026 Catch-All Benchmark](https://mailveri.com/resources/b2b-email-decay-catch-all-benchmark) · [Catch-All Emails Explained](https://mailveri.com/blog/catch-all-emails-explained) · [MailVeri vs MillionVerifier](https://mailveri.com/compare/mailveri-vs-millionverifier) · [Case Studies](https://mailveri.com/case-studies)

## Frequently Asked Questions

### What are the 7 email verification statuses returned by MailVeri?

MailVeri classifies every email address into 7 granular deliverability statuses: VALID (confirmed active mailbox), INVALID (syntax error, dead MX, or 550 mailbox rejection), DISPOSABLE (temporary/burner domain from 100,000+ tracked providers), ROLE_ACCOUNT (departmental inbox such as support@, info@, or sales@), CATCH_ALL (domain accepts all incoming mail at the gateway), FULL_INBOX (over-quota mailbox), and UNKNOWN (transient server deferral — 0 credits charged).

### How many emails can I verify in a single bulk upload on MailVeri?

You can upload and verify up to 1,000,000 email addresses per file in CSV, Excel (.xlsx, .xls), or TXT format, with automated column detection and categorized download exports.

### Does MailVeri support AI agents via Model Context Protocol (MCP)?

Yes. MailVeri includes a native Model Context Protocol server (mailveri-mcp) for Claude Desktop, Claude Code, Cursor, and Windsurf, allowing AI agents to verify single emails, run bulk batches, and inspect credit balances directly.