Private Verification Engine

Bulk Email Verification Pipeline

Automate your list hygiene with high-speed SMTP checks and domain validation, ensuring your emails reach the inbox every time.

Verification WorkflowLive Status
Private Infrastructure
Your data stays secure and accessible only to you
mailcheck://engine.v1/smtp-handshake
SMTP Worker Active
Stage 01 Details

SMTP Handshake

Initiates direct SMTP connections to target mail servers to verify mailbox existence without sending actual emails, ensuring high-accuracy deliverability checks.

Processing Speed
50k/min
Avg Latency
12 ms
Accuracy Rate
Verified
Connection Success99%
{
  "protocol": "smtp_v2",
  "threads": 32,
  "timeout_ms": 500,
  "mx_lookup": true,
  "stealth_mode": true
}
Verify your email lists with total privacy.
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Data Export Engine

Flexible Data Export & Integration

MailCheck provides secure, high-throughput export options for your verified email data, ensuring seamless integration with your existing infrastructure.

Secure API Access Bulk CSV Processing Webhook Integration
Format 01 // Data HygieneGlobal RFC Compliance
Bulk CSV Verification Results
Full-scale verification logs including status codes, deliverability scores, and risk flags for massive email lists.

Spec Details

Format: CSV | Encoding: UTF-8 | Delimiter: Comma

Integration Support

Excel
Google Sheets
CRM

Sample Request

“Clean 500k lead list for Q4 outreach campaign.”

Processing Speed10k/min
Accuracy Rate99.9%
DATA PREVIEW // CSV-EXPORT
Status Summary

Status: Verified | Deliverable: 98.2% | Risk: Low

Data Structure
Columns included: – Email Address – SMTP Status Code – MX Record Health – Disposable Flag – Spam Trap Risk
Action

Download full report for immediate list import.

Auto-sorted by deliverability score for priority processing.
Ready to export your verified list?Start Export

Universal Export Compatibility

MailCheck supports all major data formats to ensure your verified lists are ready for immediate use.

01

CSV Export

Full-scale verification logs including status codes, deliverability scores, and risk flags for massive email lists.

Ready in 10k/min
02

JSON API

Real-time verification data streams formatted for direct ingestion into your internal backend or marketing automation stack.

Ready in 42ms
03

Summary

High-level health metrics for your email lists, identifying bounce trends, domain quality, and overall list hygiene.

Ready in Full List
04

Segments

Isolate specific segments like 'High-Value Deliverable' or 'Risky Catch-All' for targeted re-engagement campaigns.

Ready in Unlimited
Instant Export

Ready to Clean Your Lists?

Upload your email lists and get verified, export-ready data in seconds. Secure, private, and fast.

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MailCheck is a private email verification platform built to cleanse large lists, detect risky addresses, and maximize campaign deliverability.

MailCheck v1.0Secure Hygiene

Bulk Scan

High-volume checks

SMTP Logic

Real-time validation

Data Hygiene

Bounce reduction

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Verify your email lists

Cleanse your data and protect your sender reputation today.

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