Marketers
Email Validation for Email Marketers — Boost Deliverability
Validate every subscriber before they hit your list. Catch disposable emails, fix typos, and protect your sender reputation with real-time verification.
End-to-End Protection
Your complete email quality pipeline
From signup to send, Mailchk protects every stage of your email lifecycle. Block bad addresses, clean your lists, score deliverability, and verify inbox placement.
Block at the Gate
Real-time signup protection
Stop fake, disposable, and scam emails the moment a user hits your signup form. Our API responds in under 50ms — before the page even finishes loading.
Clean Your Lists
Bulk CSV validation & catch-all testing
Already have an email list? Upload it and we'll scrub out the fakes, catch-all addresses, and dead mailboxes. Validate thousands of emails in minutes, not hours.
Score Every Email
Risk & deliverability scoring
Get a 0-100 deliverability score and risk level for every address. Prioritize your safest contacts and flag the risky ones before they damage your sender reputation.
Test Inbox Placement
Know where your emails land
Send a test email and see exactly where it ends up — Primary inbox, Promotions, Spam, or blocked entirely. Test across Gmail, Outlook, and Yahoo before you hit send on your campaign.
Test & Capture
Inspect every email your app sends
Create disposable test inboxes and send your transactional or marketing emails to them. Inspect the full content — HTML rendering, headers, attachments, and plain text — before going live.
Protect your platform at every stage of the email lifecycle
<2%
Bounce Rate Target
470K+
Scam Domains Blocked
0–100
Deliverability Score
15+
Validation Checks
Live Preview
See Subscriber Validation in Action
Watch how real-time validation catches bad emails at the point of signup — before they ever reach your list.
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The Problem
How Bad Emails Destroy Email Marketing Performance
High bounce rates, disposable addresses, and inflated lists silently sabotage your campaigns.
Low Deliverability
Invalid and risky emails cause bounces that damage your sender reputation and tank inbox placement rates.
ESP Suspension Risk
Email service providers suspend accounts that exceed bounce rate thresholds — putting your entire sending infrastructure at risk.
Misleading List Sizes
Your "50,000 subscriber list" may only have 30,000 valid addresses — inflated numbers lead to inflated expectations.
Disposable Abuse
Disposable and temporary email addresses inflate your list with subscribers who will never engage or convert.
Capabilities
Everything You Need to Keep Your List Clean
From pre-send validation to real-time subscriber verification — every tool a marketer needs for deliverability.
Pre-Send List Validation
Clean your entire subscriber list before every campaign. Reduce bounce rates below 2% and protect your sender reputation.
Email Watchdog
Add a watchdog address to your mailing list and every campaign is automatically screenshotted, diffed, and checked for broken links and dead images.
Inbox Placement Testing
Send a test email and see where it lands — Primary, Promotions, or Spam — across Gmail, Outlook, and more.
Disposable Email Detection
Block 470,000+ disposable email domains from your subscriber lists. Stop wasting sends on addresses that will never engage.
Deliverability Scoring
Every email gets a 0-100 deliverability score. Segment your list by quality and focus on high-value subscribers.
Domain Typo Recovery
Catch subscriber typos like hotmal.com or gmial.com. Suggest corrections instead of losing real subscribers.
Domain Authentication
Verify SPF, DKIM, and DMARC records on subscriber domains to predict inbox placement and delivery success.
Recommended Products
Email Validation Tools for Marketers
Email List Validation
Clean your subscriber list before every campaign. Upload CSVs and export clean lists.
Explore List Validation NewEmail Watchdog
Monitor every campaign automatically. Catch broken links, dead images, and layout changes before your subscribers do.
Explore WatchdogInbox Placement Testing
Test inbox placement before sending campaigns across all major providers.
Learn MoreEmail Validation API
Validate new subscribers in real-time to keep your list clean from day one.
Explore APIForm Guard
Add inline validation to your signup and subscription forms with zero backend work.
Explore Form GuardDon't just take our word for it
See why teams rely on Mailchk to keep their email lists clean
"Mailchk reduced our fake signups by 89%. The API is incredibly fast and the documentation is excellent."
Noel S
CTO, MyBrands Group
"We integrated Mailchk in under an hour. It catches disposable emails that other services miss."
Stephen M
Lead Developer, TRTCompare
"Finally, a solution that actually works. Our email deliverability improved by 40% after implementing Mailchk."
Michael G
Product Manager, Evernu
"The real-time validation is a game changer. No more wasted resources on fake accounts."
Joe S
Founder, Moojority
"Mailchk handles our 100k+ daily validations without breaking a sweat. Incredible performance."
Katie E
DevOps Lead, CVS
"Switched from a competitor and never looked back. Better accuracy, better pricing, better support."
Brendan O
Tech Lead, CardGenr
"Mailchk reduced our fake signups by 89%. The API is incredibly fast and the documentation is excellent."
Noel S
CTO, MyBrands Group
"We integrated Mailchk in under an hour. It catches disposable emails that other services miss."
Stephen M
Lead Developer, TRTCompare
"Finally, a solution that actually works. Our email deliverability improved by 40% after implementing Mailchk."
Michael G
Product Manager, Evernu
"The real-time validation is a game changer. No more wasted resources on fake accounts."
Joe S
Founder, Moojority
"Mailchk handles our 100k+ daily validations without breaking a sweat. Incredible performance."
Katie E
DevOps Lead, CVS
"Switched from a competitor and never looked back. Better accuracy, better pricing, better support."
Brendan O
Tech Lead, CardGenr
Reduce Bounce Rates and Protect Sender Reputation
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