Stop bounces.
Verify emails instantly.
Clean your email list with 99.7% accuracy. Protect your sender reputation, improve open rates, and send every campaign with confidence.
Every bounce costs you reputation, revenue, and reach.
MailGuard removes invalid, risky, and disposable addresses before they ever reach your mail server.
Stop bounces at the source
Cut bounce rate to under 2%. Hard bounces tank your sender score — we catch them before you hit send.
Protect sender reputation
Major inbox providers reward clean senders. Avoid the spam folder and keep your domain trusted.
Boost open & click rates
A clean list means real people. Watch your campaign metrics climb without changing a single subject line.
From upload to clean list in 3 steps
Upload your list
Drop a CSV or paste addresses. We auto-detect the email column — no formatting required.
We verify silently
20+ checks per address: syntax, MX, SMTP, catch-all, disposable, role, blacklist — all passive.
Download clean results
Export a clean CSV with verdicts and reason codes. Ready to import into any ESP.
Every check your list needs
Bulk verification
Process up to 1,000,000 addresses per upload. Live progress, downloadable reports.
Real-time check
Verify single addresses instantly. Perfect for signup forms and one-off lookups.
MX record lookup
Confirms a real mail server is listening before any SMTP probe.
Catch-all detection
Flags domains that accept everything — so you decide whether to risk it.
Disposable filter
Blocks 50,000+ throwaway domains used to bypass signup walls.
Spam-trap guard
Identifies known traps and pristine traps before they damage your reputation.
Common questions
How accurate is MailGuard?+
We average 99.7% 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.
What file formats can I upload?+
CSV and TXT files up to 1,000,000 rows. We auto-detect the email column for you.