InboxEagle
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Email Spam Score Tester

Your campaign looks fine in preview — but inbox providers run 200+ spam checks before delivering it. Send a test email and get a full spam analysis: authentication, SpamAssassin score, blacklist status, and content flags, all before you hit send.

Test Your Email's Spam Score

We'll generate a unique test address. Send your email to it, and we'll analyze everything — authentication, content, reputation, and more.

Get your full spam analysis report emailed to you

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What Inbox Providers Check Before Delivering Your Email

Authentication: the first filter your email hits

Before inbox providers evaluate content, they check SPF, DKIM, and DMARC. A single authentication failure lowers your email's reputation score before any content analysis begins. Emails failing DMARC at Gmail are automatically routed to spam if your policy is p=quarantine.

SpamAssassin: the content scoring engine

SpamAssassin assigns point values to hundreds of content signals — excessive punctuation, all-caps subject lines, HTML-to-text ratio, image-only emails, certain link patterns, and specific phrases. A score above 5 is typically filtered. This tool shows your score before the ISP sees it.

Blacklist checks at send time

Inbox providers query real-time blacklists at the moment of delivery — not when you send. If your IP was listed 10 minutes ago, your current campaign may already be blocked. The spam tester checks 50+ blacklists as part of the analysis.

Content signals that trigger filters in 2025

The signals that correlate most with spam filtering in 2025: excessive use of link shorteners, mismatched From and Reply-To domains, HTML without a plain-text alternative, subject lines containing spam trigger words, and body links pointing to recently registered domains.

How Spam Scoring Works

Your email receives a score from 0 to 10, where 10 is perfect. The score is calculated across six categories:

  • 3.0 pts Authentication — SPF, DKIM, and DMARC configuration
  • 2.0 pts SpamAssassin — content-based spam detection score
  • 2.0 pts Blacklists — sending IP reputation across major DNSBLs
  • 1.5 pts Content — trigger words, HTML ratio, image balance
  • 1.0 pts Headers — List-Unsubscribe, Message-ID, Date accuracy
  • 0.5 pts Server — reverse DNS, HELO identity, MX records

A score of 9 or above means your email is well-configured and unlikely to hit spam. Below 5, there are critical issues you should fix before sending campaigns.

Lock Down Your Authentication

Deliverability Health Check → DMARC Record Generator → SPF Record Builder → Blacklist Checker → Spam Word Checker →

Learn More

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How Email Spam Filters Work
What the spam scoring algorithm is actually evaluating in your emails.
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How Spam Rates Affect Gmail Promotions Placement
671K email study: the relationship between your spam score and Promotions vs. spam folder outcome.

Why We Built This Tool

Most email service providers don't run pre-send spam analysis — teams send first and check reports after the fact. SpamAssassin scoring, authentication validation, and blacklist status are published standards, but ESPs don't surface them before send. This tool brings pre-send visibility to the same checks ISPs actually run.

What Goes Wrong Without This

Configuration problems stay hidden. An SPF record has a typo, DKIM is missing a selector, DMARC is at p=none — none of these failures trigger warnings in your ESP until mail is already bouncing or landing in spam. Testing before sending the campaign catches these six hours before they affect thousands of subscribers.

Who This Tool Is For

E-commerce & DTC Brands

Campaign teams testing emails before sending to millions of subscribers — catching authentication breaks and blacklist status that would silence a campaign.

Email Marketing Agencies

Technical teams auditing client sending infrastructure and validating each client's authentication configuration (SPF, DKIM, DMARC) before onboarding.

B2B SaaS & Outbound Teams

Developers sending transactional and notification emails who need to verify domain reputation and authentication on a per-sending-domain basis.

Frequently Asked Questions

What's the difference between a spam score and inbox placement?
Spam score reflects what automated filters see: authentication gaps, blacklist status, and content flags. Inbox placement measures where your email actually lands across real mailboxes at Gmail, Yahoo, and Outlook. A score of 9 and failing inbox placement means content is fine but your domain reputation is broken. This tool catches the first; real-world placement tests catch the second.
Why would my test pass but my campaign fail?
A single test email from a clean IP might score high even if your sending IP has poor reputation. A test from your production server might fail immediately. Volume and frequency matter too — 1,000 emails/day from a new domain triggers more scrutiny than 100. This tool tests configuration; InboxEagle's monitoring tracks actual campaign placement.
Is a score of 7 or 8 acceptable?
Acceptable depends on your sending pattern. Daily newsletters from an established domain scoring 7 might place 95% at Gmail. A 7 from a new domain might hit 40% inbox. The score predicts risk categories; real reputation and volume determine outcome. Aim for 8+ to be safe across all scenarios.
Do I need an InboxEagle account to use this tool?
No. This tool is completely free and requires no account or sign-up. InboxEagle provides it as a standalone resource for email marketers, developers, and agencies.

Test Before You Send. Monitor After You Do.

Manual pre-send tests catch problems in a single campaign. InboxEagle monitors your inbox placement rate on every domain you send from — surfacing spam filter trends across Gmail, Outlook, and Yahoo so you see deliverability sliding before it affects revenue. Start free — no credit card required.

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