Email Deliverability Testing
Know exactly why your emails land in spam
SpamBarometer analyses your emails against SpamAssassin rules, checks SPF/DKIM/DMARC authentication, and provides AI-powered recommendations to improve deliverability.
| SPF | Pass |
| DKIM | Pass |
| DMARC | Pass |
| Spam Score | 0.3 |
| Content | 2 suggestions |
What is email deliverability and why does it matter?
Email deliverability is the ability of your emails to reach the recipient's inbox rather than being filtered into spam or blocked entirely. Even well-crafted emails can fail to reach their audience if the sender's domain lacks proper authentication, the content triggers spam filters, or technical issues go undetected. Poor deliverability means lost revenue, missed communications, and damaged sender reputation.
SpamBarometer helps you identify and fix these issues before they affect your campaigns. By sending a test email to our system, you get a comprehensive analysis covering authentication protocols, spam rule triggers, content quality, and more — all in seconds. Whether you send transactional emails, marketing campaigns, or cold outreach, testing deliverability is the first step toward reliable inbox placement.
What we analyse
Authentication
SPF, DKIM, and DMARC validation with detailed pass/fail explanations. We check whether your sending domain has correctly configured DNS records and whether the email headers align with your domain's authentication policies. Misconfigured authentication is one of the most common reasons emails land in spam.
Spam Scoring
SpamAssassin analysis with rule-by-rule breakdown and scoring impact. Your email is tested against hundreds of spam detection rules, and each triggered rule is shown with its score contribution and a plain-language explanation of what it means and how to fix it.
Content Analysis
Text-to-HTML ratio, link analysis, image handling, and spam phrase detection. We examine your email's structure to identify issues like excessive images without alt text, broken links, or content patterns that trigger spam filters across major email providers.
AI Recommendations
Actionable suggestions powered by GPT-4 to improve your email content. Our AI analyses your subject line, body copy, and overall structure to provide specific, prioritised recommendations that address both deliverability and engagement.
Why test with SpamBarometer?
Catch issues before your recipients do
Sending a campaign without testing is like publishing a website without checking for broken links. SpamBarometer catches missing SPF records, DKIM signature failures, DMARC alignment issues, spam trigger words, poor text-to-HTML ratios, and dozens of other problems that silently hurt your inbox placement rate.
Real-world spam filter testing
We use the same SpamAssassin engine that powers spam filtering at thousands of email providers worldwide. Your score here reflects how real mail servers evaluate your email, giving you a reliable preview of deliverability before you hit send.
Understand, don't just score
A spam score alone isn't useful without context. SpamBarometer breaks down every triggered rule with plain-language explanations and specific remediation steps, so you know exactly what to change and why it matters.
Free to start, no credit card required
Run up to 30 tests per day on our free plan with full spam analysis and authentication checks. Upgrade to Premium for AI-powered content recommendations and unlimited test history.
How it works
Get a unique test address
We generate a unique email address for your test. Send your email to this address from your actual sending system.
We analyse everything
Authentication headers, spam rules, content structure, and more are checked automatically.
Get actionable results
View detailed scores, identified issues, and specific recommendations to improve deliverability.
Ready to improve your email deliverability?
Create a free account to save your test history and access premium features.
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