Features - MAILCHECK

VERIFICATION STACK

Private email verification engine

High-volume list cleansing with real-time SMTP checks, syntax analysis, and domain health monitoring for your private use.

SYNTAX VALIDATION

Strict RFC-compliant syntax analysis

Our engine validates every address against official RFC standards, ensuring perfect formatting and preventing malformed data from entering your lists.

RFC-5322-STRICTREGEX-ENGINE-V2DISPOSABLE-BLOCK

Regex pattern matching

Deep inspection of local and domain parts for standard compliance.

Character encoding check

Detects invalid characters or non-standard encoding formats.

Length validation

Ensures addresses meet global length constraints for delivery.

Disposable domain filter

Identifies and flags temporary email providers instantly.

View syntax rules

Syntax Telemetry

Syntax Verified

Malformed Entries

RFC Coverage

100%

verification_log.json

POST /v1/syntax/check
{
  "email": "user@domain.com",
  "rfc_status": "VALID",
  "disposable": false
}

Live verification streamSTATUS: READY

Operational Edge

Maximize your reach with cleaner data

Stop wasting bandwidth on dead addresses. MailCheck automates your list hygiene, ensuring every message reaches a real inbox.

High Throughput

Rapid List Cleansing

Verify massive email volumes in seconds. Our engine strips out invalid, inactive, and risky addresses to keep your lists pristine.

Real-time SMTP checks

Active processing

Reputation Guard

Sender Score Defense

Protect your domain reputation by eliminating hard bounces and spam traps before they trigger ISP blacklisting or delivery blocks.

24/7 bounce reduction

Syncing reputation

Private Access

Sovereign Data Security

Your email lists remain exclusively yours. We provide a private, single-tenant environment for all your verification operations.

Zero-leak architecture

Securely locked

Need to verify a massive list? Our API handles millions of records with sub-second latency.

View process