# mailtester.ai

> AI-optimized mirror of mailtester.ai containing 27 pages totalling 23,882 words of clean markdown content, structured data, and semantic HTML. Original source: https://mailtester.ai. Last updated: 2026-09-12T07:27:20.732Z.

Each page is available as HTML (with JSON-LD structured data) and Markdown (text-only, ideal for LLMs and RAG).

## Articles & Blog Posts

- [llms-txt.html](/content/llms-txt.html) (464 words)
- [api/ai/mailbox/index.html](/content/api/ai/mailbox/index.html) (106 words)
- [Mailtester.ai vs mail-tester.com: which mail tester?](/content/mailtester-vs-mail-tester/index.html): A mail-tester.com alternative, or the same tool? mail-tester.com scores your email out of 10. Mailtester.ai predicts where it lands, in plain English. (907 words)
- [Free BIMI Checker | Will Your Logo Show in Gmail?](/content/bimi-checker/index.html): Check your BIMI record, logo file and certificate in one go — and see your logo in a mocked Gmail inbox row. Free, instant, no signup. (1,418 words)
- [Free Spam Words Checker | Test Your Email Copy](/content/spam-words-checker/index.html): Paste your subject line or email copy and see which spam trigger words it contains. Free, instant, nothing leaves your browser — plus the honest answer on how much words actually matter. (1,301 words)
- [Free HTML Email Checker | Test Your Email HTML Code](/content/html-email-spam-checker/index.html): Paste your email HTML and see what will break — Gmail clipping, unclosed tags, missing alt text, CSS that Outlook ignores. Free, instant, nothing leaves your browser. (1,463 words)
- [AI Email Content Analyzer](/content/ai-content-analyzer/index.html): Score any email free and unlimited. Then unlock the AI deep-dive: rewriting suggestions, spam prediction, and engagement optimization for your content. (1,080 words)
- [Why Are My Emails Going to Spam? The 5 Real Reasons](/content/why-emails-going-to-spam/index.html): Emails landing in spam or the Promotions tab? The five real reasons legitimate email gets filtered — and a free 30-second test that shows where yours lands. (1,399 words)
- [Free SMTP Tester & Mail Server Checker](/content/smtp-tester/index.html): Test your SMTP server configuration instantly. Free SMTP tester with connectivity, authentication, and deliverability checks. (724 words)
- [Free Email Open Rate Predictor](/content/open-rate-predictor/index.html): Predict your email open rates with AI. Free calculator with industry benchmarks and subject-line tips to boost engagement. (775 words)
- [Klaviyo Emails Going to Spam? See Where They Land](/content/klaviyo-spam/index.html): Klaviyo campaign or flow landing in spam or Promotions? The five real causes — shared klaviyomail, popup-grown lists, BFCM bursts — and a free 30-second test. (1,284 words)
- [Free Email Inbox Tester | Gmail Primary Inbox](/content/primary-inbox-tester/index.html): Free, unlimited test of whether your emails land in Gmail's Primary inbox or Promotions tab — with a plain-English verdict and the three things to fix. (791 words)
- [Substack Emails Going to Spam? See Where They Land](/content/substack-spam/index.html): Substack newsletter landing in spam or Promotions? The five real causes and a free 30-second test that shows where your next post actually lands. (1,085 words)
- [Newsletter in Gmail's Promotions Tab? Test It Free](/content/gmail-promotions-tab/index.html): Newsletter landing in Gmail's Promotions tab instead of Primary? What actually decides the tab, what you can honestly change, and a free 30-second test. (1,065 words)
- [Beehiiv Emails Going to Spam? See Where They Land](/content/beehiiv-spam/index.html): Beehiiv newsletter landing in spam or Promotions? The five real causes — shared sending pools, imported lists, growth widgets — and a free 30-second test. (1,146 words)
- [Free DMARC Validator & Policy Checker](/content/dmarc-validator/index.html): Validate and check your DMARC policies instantly. Free DMARC validator with detailed policy analysis, alignment checking, and email security recommendations. (807 words)
- [Free SPF Record Checker & Validator](/content/spf-checker/index.html): Check and validate your SPF records instantly. Free SPF checker with syntax validation and clear deliverability fixes. (766 words)
- [Free DKIM Analyzer & Signature Validator](/content/dkim-analyzer/index.html): Analyze and validate your DKIM signatures instantly. Free DKIM analyzer with detailed signature verification, key validation, and email authentication testing. (753 words)
- [Free Email Spam Score Tester](/content/spam-tester/index.html): Test your email spam score instantly. Free spam score tester with SpamAssassin analysis and fixes to avoid spam filters. (963 words)
- [Free Email Header Analyzer — Nothing Leaves Your Browser](/content/email-header-analyzer/index.html): Paste a raw email header and read it in plain English: every hop and where the time went, SPF, DKIM and DMARC, sender mismatches. Parsed in your browser. (803 words)
- [Kit (ConvertKit) Emails Going to Spam? Test It Free](/content/kit-spam/index.html): Kit broadcast landing in spam or Promotions? The five real causes — shared sending, unverified domains, cold-list blasts — and a free 30-second placement test. (808 words)
- [Pricing — Mailtester.ai](/content/pricing/index.html): Score any email free and unlimited — no card to start. Credits at €4.99 (499 credits) for the occasional AI deep-dive, or monthly from €9.99. Cancel anytime. (640 words)
- [SpamAssassin Score, Explained: Why 10/10 Still Hits Spam](/content/spamassassin-score/index.html): What your SpamAssassin score out of 10 means — what counts as good, how it's calculated, and why a perfect 10/10 can still land in spam. Free 30-second test. (748 words)
- [Mailchimp Emails Going to Spam? See Where They Land](/content/mailchimp-spam/index.html): Mailchimp campaign landing in spam or the Promotions tab? The five real causes and a free 30-second test that shows where your next send actually lands. (902 words)
- [Free Email Spam Checker — See Where Your Newsletter Lands](/content/email-spam-checker/index.html): Free email spam checker: forward your email and see whether it lands in Primary, Promotions or Spam across real Gmail, Outlook and Yahoo. Results in about 30 seconds. (600 words)
- [Privacy Policy — Mailtester.ai](/content/privacy/index.html): This Privacy Notice describes how MailTester.ai ("we", "us", "our") collects, uses and discloses information about you when you use our services (the "Services"). For the purposes of this Privacy Notice, "you" and "your" means you as the user of the Services. (803 words)
- [Sample report — Mailtester.ai](/content/sample-report/index.html): Here's what your deliverability report looks like. Score, verdict, three fixes in priority order, and an AI rewrite of the subject line. (281 words)

## Resources

- [Full Page Index](/index.html): Browse all cached pages with rich metadata
- [About This Cache](/about.html): Methodology, technical details, and usage guidelines
- [XML Sitemap](/sitemap.xml): Machine-readable sitemap for crawler discovery
- [Robots.txt](/robots.txt): Crawler directives
- [AgentSite Network](https://agentsite.network/network.html): Public index of AgentSites and their machine-readable resources