Email verification that protects your sender reputation
Catch invalid, risky, and disposable addresses before they hurt your deliverability. Real-time API and bulk CSV uploads with 99.2% accuracy.
Everything you need to keep lists clean
From single-email checks to multi-million-row bulk jobs.
Real-time API
Sub-2-second verification with SMTP, MX, role, disposable, and catch-all detection.
Bulk CSV uploads
Process 10K, 100K, or 1M+ addresses with auto column detection and exportable reports.
Deliverability shield
Reduce bounce rate to under 2% and protect your domain reputation across providers.
Privacy first
GDPR-compliant. No data resale, no list aggregation. Your data is yours.
Global infrastructure
Edge-deployed in 12 regions for low latency anywhere in the world.
99.99% uptime
Production-grade SLA with status page and incident transparency.
From upload to clean list in 3 steps
Upload
Drop a CSV or paste addresses. We auto-detect the email column.
Verify
We run 20+ checks per address — syntax, MX, SMTP, catch-all, disposable, role, blacklist.
Export
Download a clean CSV with per-address status and reason codes.
Loved by growth, lifecycle, and ops teams
"We cut our bounce rate from 9% to 1.4% in a single campaign. The CSV upload handled 380K addresses without breaking a sweat."
"The API is fast enough to run on every signup. Our list quality has never been better and our domain reputation finally recovered."
"Switched from a competitor and saved 40% while getting better catch-all detection. Support actually replies within hours."
Common questions
How accurate is MailGuard?+
We average 99.2% accuracy across our customer base, with full transparency on catch-all and unknown statuses.
Will verification hurt my sender reputation?+
No. We verify silently using passive SMTP techniques that don't generate bounces.
Do credits expire?+
Never. Buy once, use whenever — even years later.
Can I integrate with my signup form?+
Yes. Our API responds in under 2 seconds and is built for real-time use.