Catch Email Disasters
Before They Cost You Money
Test your campaign in 60 seconds with professional-grade validation. No signup, no credit card - just instant peace of mind.
Try It Free
Test Your Campaign Right Now
Get instant feedback on your email campaign. No signup required.
Test Your Email Campaign For Free
Get instant feedback on deliverability, authentication, and compliance
No credit card required • Results in ~60 seconds • Expires in 24 hours
18 Comprehensive Checks
Never Send a Broken Email Again
From career-ending disasters to professional optimizations - we catch it all in 60 seconds.
Instantly catch 404 errors and broken links before they cost you revenue
Never send 'Hi {{FirstName}}' again - validate all personalization
Ensure CAN-SPAM compliance with unsubscribe link validation
Verify SPF, DKIM, and DMARC to protect sender reputation
Flag suspicious-looking links that trigger spam filters
Check image file sizes and alt text for better deliverability
Ensure tracking parameters are properly formatted
Avoid spam trigger words and excessive punctuation
Validate proper HTML structure for consistent rendering
Preview how your email looks on mobile devices
See how your email appears in dark mode clients
Ensure your emails are accessible to all recipients
Optimize for fast loading across all email clients
Verify all tracking pixels and links work correctly
Maintain optimal balance to avoid spam filters
Make sure your preheader text enhances open rates
Validate required footer elements and legal text
Ensure reply addresses are valid and monitored
How It Works
Email validation in 3 simple steps
No complex integrations. No lengthy setup. Just instant validation that saves your reputation.
- 1Enter Your Email
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Get your unique test address instantly. No signup, no credit card required.
- 2Send From Your ESP
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Use your ESP's "Send Test" button to send your campaign to the test address.
- 3Get Results in 60 Seconds
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Receive detailed analysis via email with actionable fixes for any issues found.
Works With Your Tools
Quick Start Guide for Popular ESPs
No matter which platform you use, testing is simple
Klaviyo
In your campaign editor, click "Send Test" → Paste your test address → Click "Send"
Mailchimp
Use "Preview and Test" → Enter test email address → Click "Send Test"
HubSpot
Click "Test Send" → Add your test address → Click "Confirm"
SendGrid
Use "Send Test" option → Enter test address → Click "Send"
Works with any ESP that can send test emails - Brevo, ConvertKit, ActiveCampaign, and more
The Stakes Are High
Why Testing Every Campaign Matters
Email mistakes aren't just embarrassing—they're expensive. Every broken link, wrong merge tag, or compliance issue costs real money and damages your reputation.
- Average cost of one email mistake
- $8,500
- Lost revenue from a single broken campaign
- Campaigns with critical errors
- 23%
- Industry-wide email error rate
- To validate your entire campaign
- 60 sec
- vs 30+ minutes manual checking
- Marketers protected by SendGuard
- 10,000+
- Join thousands of professionals
Frequently Asked Questions
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Yes! Get instant access to a test email address with no credit card required. Send your campaign and receive detailed results in about 60 seconds. It's the perfect way to see the value before committing to a plan.
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Your test address expires after 24 hours for security. This one-time preview shows you exactly what SendGuard can catch in your campaigns. To protect every campaign you send with permanent addresses and saved history, start a free trial of our paid plans.
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The free preview is great for seeing what we catch, but paid plans give you unlimited checks, permanent test addresses, saved campaign history, team collaboration, API access, and priority support. Never worry about email mistakes again - test every campaign before it goes out.
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SendGuard works with any email platform that can send test emails - Klaviyo, Mailchimp, HubSpot, SendGrid, Brevo, ConvertKit, ActiveCampaign, and many more. If your ESP has a 'Send Test' button, it works with SendGuard.
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Our validation is the same professional-grade system used by thousands of marketing teams. We run 18 comprehensive checks covering everything from broken links and authentication to accessibility and mobile responsiveness. You get the same accuracy in the preview as our paid customers get every day.
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Manual checking takes 30+ minutes and you'll still miss things. SendGuard runs 18 automated checks in 60 seconds, catching issues humans overlook - like broken authentication, accessibility problems, and mobile rendering issues. One missed error can cost thousands in lost revenue.
Is the preview check really free?
What happens after 24 hours?
Why should I upgrade to a paid plan?
Which email platforms does this work with?
How accurate are the checks?
What makes SendGuard different from manual checking?
Ready for Unlimited Campaign Testing?
Start your free trial and test every campaign with confidence. No credit card required.