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Mail Tester — free email spam test and inbox placement checker.
Get a free spam score, inbox signals, and fixes before your next campaign. Send an email to your generated test address and read the full report.
First, send your email to:
Send your real campaign or test message from your own sending setup, then check the score. Each address is valid for one test session.
How does the mail tester work?
We analyze the message
We check spam score, content issues, authentication, blacklist signals, and inbox placement factors.
Review and fix
See what failed, why it matters, and what to change before sending the campaign.
What do you get in the report?
Spam score and risk level
A SpamAssassin score from 0–10 highlighting the issues that affect deliverability.
Top content issues
Trigger words, missing unsubscribe headers, broken URLs, and risky formatting.
Blacklist report
Whether your IP or domain is listed in major blacklists — including flags on email links.
Authentication report
SPF, DKIM, DMARC, and reverse DNS checks with alignment details.
Inbox deliverability score
An overall rating based on content, authentication, and sender reputation — including which Gmail tab you land in.
Actionable fixes
How to fix each failed check directly in the report, with the expected impact of every change.
Example email test report.
Score: 7.5/10 — Needs improvement. Each finding explains why it matters and how to fix it.
Missing List-Unsubscribe header — high impact
Mailbox providers expect a clear unsubscribe option; missing it increases spam complaints. Fix: add List-Unsubscribe with one-click unsubscribe. Impact: higher inbox placement, fewer complaints.
Tracking / redirect URLs detected — medium-high impact
Multiple redirects and tracking parameters look suspicious to filters. Fix: reduce redirect hops, avoid URL shorteners, use a branded tracking domain. Impact: lower spam risk, better link reputation.
DMARC policy not enforced (p=none) — medium impact
Monitoring-only DMARC doesn't protect against spoofing. Fix: move from p=none to p=quarantine, then p=reject after monitoring. Impact: improved domain trust, reduced spoofing risk.
Content signals increase spam risk — medium impact
Promotional phrasing, too many links, and image-heavy layouts trigger filters. Fix: rewrite the subject and first lines, reduce links, add a plain-text version. Impact: lower spam score, consistent placement.
What does the deliverability test evaluate?
1. Spam scoring
SpamAssassin assigns a 0–10 score highlighting issues that affect deliverability.
2. Gmail deliverability
Whether Gmail marks your email as spam, and which tab it lands in: Primary, Social, Promotions, Updates, or Forums.
3. Authentication
SPF authorization, DKIM signature validity, and DMARC policy alignment with both.
4. Server and domain
Reverse DNS against the HELO/EHLO domain, TLD reputation, and domain age.
5. Blacklist monitoring
Scans major blacklists for your IP, domain, and every link inside the email.
6. Content and structure
Broken links, risky shorteners, subject-line engagement, List-Unsubscribe compliance, and HTML spam triggers.
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 do emails go to spam?
Emails go to spam due to content issues, spam trigger words, missing or weak authentication, poor sender reputation, or blacklisted IPs and domains.
How do I fix a failed email test?
Review the detected issues, improve content, fix authentication problems, remove suspicious links, ensure unsubscribe information is present, and resolve any blacklist listings.
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Ready to send after the test?
Use SMTP-X's SMTP relay to send with logs, tracking, and better deliverability — dedicated IPs from €39/month for 100,000 emails.
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