Content Content
Mail Tester – Free Email Spam Test & Inbox Placement Checker
Get a free spam score, inbox signals, and fixes before your next campaign.
What you’ll get in your report
Spam score and risk level
SpamAssassin score
Top content issues detected
Trigger words, missing unsubscribe, broken URLs, etc.
Blacklist report
IP/domain is listed in major blacklists
Mail authentication report
SPF, DKIM, DMARC, rDNS
Inbox deliverability score
Overall deliverability rating based on content, authentication, and sender reputation.
Actionable fixes
See how to fix each failed check directly in the report (no extra navigation).
Example Email Test Report
7.5/10
Needs Improvement
Missing List-Unsubscribe header High impact
Why this matters
Mailbox providers expect a clear unsubscribe option. Missing it increases spam complaints and can reduce inbox placement.
How to fix
- Add List-Unsubscribe and enable one-click unsubscribe.
Expected impact
- Higher inbox placement • Fewer spam complaints
Tracking / redirect URLs detected Medium–High impact
Why this matters
Multiple redirects and tracking parameters can look suspicious to filters and weaken link trust.
How to fix
- Reduce redirect hops, avoid URL shorteners, and use a branded tracking domain.
Expected impact
- Lower spam risk • Better link reputation
DMARC policy not enforced (p=none) Medium impact
Why this matters
Monitoring-only DMARC doesn’t protect against spoofing. Enforcing DMARC improves domain trust over time.
How to fix
- Move from p=none → p=quarantine → p=reject after monitoring reports.
Expected impact
- Improved domain trust • Reduced spoofing risk
Content signals increase spam risk Medium impact
Why this matters
Promotional phrasing, too many links, and image-heavy layouts can trigger spam filters.
How to fix
- Rewrite the subject and first lines, reduce links, and add a plain-text version.
Expected impact
- Lower spam score • More consistent inbox placement
Next best actions
- Add List-Unsubscribe (one-click)
- Clean tracking links and redirects
- Rewrite subject and introduction
- Enforce DMARC protection
Spam Score Content
Auth Content
Fix Content
Email Deliverability Testing Overview
Our testing suite ensures your emails land in the inbox, not spam. Below is a concise overview of what we evaluate:1.Spam Scoring Analysis
- SpamAssassin Check: Assigns a spam score (0–10) to your email, highlighting issues affecting deliverability.
2.Gmail Deliverability Tests
- Spam Filter Evaluation: Determines if Gmail marks your email as spam.
- Inbox Placement: Identifies which Gmail tab your email lands in (Primary, Social, Promotions, Updates, Forums).
3.Authentication Verification
- SPF: Confirms your SPF record authorizes your domain to send emails.
- DKIM: Validates correct DKIM signature for authenticity.
- DMARC: Checks DMARC policy alignment with SPF and DKIM.
4.Server and Domain Checks
- Reverse DNS: Matches sending IP with HELO/EHLO domain.
- Domain Suffix: Evaluates TLD reputation.
- Domain Age: Assesses domain age for deliverability.
5.Blacklist Monitoring
- Scans major blacklists for IP, domain, and email link flags.
6.Content and Structure Analysis
- Link Validation: Detects broken or non-functional URLs.
- Shortened URLs: Flags risky link shorteners.
- Subject Line: Analyzes for engagement.
- List-Unsubscribe: Verifies compliance.
- HTML Review: Checks for spam triggers or formatting issues.
This targeted testing optimizes your email campaigns for maximum deliverability and compliance with industry standards.
Frequently Asked Questions
What is a mail tester?
A mail tester analyzes your email for spam-related signals, content issues, authentication indicators, and blacklist status to help improve deliverability before sending campaigns
How does spam score work?
Spam score is calculated using common spam filter rules and signals such as content triggers, formatting patterns, and authentication indicators.
Why emails go to spam?
Emails may go to spam due to content-related issues, spam trigger words, missing or weak authentication signals, poor sender reputation, or blacklisted IPs or domains.
How to fix failed email test?
To fix a failed email test, review the detected issues, improve email content, fix authentication problems, remove suspicious links, ensure unsubscribe information is present, and resolve any blacklist listings.
Ready to send after the test?
Use SMTPServer.com SMTP relay to send with logs, tracking, and better deliverability.