Email Deliverability Tester

The deliverability tester runs 12 checks across four categories. Authentication (4): SPF alignment, DKIM signature validity, DMARC policy enforcement, and BIMI brand logo presence. Reputation (3): reverse DNS (PTR) records, blacklist presence across 14 major DNSBLs, and sender MX record validity. Content and Headers (4): List-Unsubscribe header for Gmail/Yahoo compliance, multipart HTML plus plain text format, subject line spam trigger analysis, and Message-ID format validation. Security (1): TLS encryption verification. You also get a full spam score with individual rule breakdowns.

A spam score of 0.0 is perfect — it means no spam rules were triggered at all. The threshold is 5.0: any score below that is considered safe. Scores between 0 and 2.0 are excellent and typical of well-configured sending infrastructure. Scores between 2.0 and 5.0 indicate some issues worth investigating. Anything at or above 5.0 means your email would likely be classified as spam by most filters. Focus on getting your score as close to 0.0 as possible.

BIMI (Brand Indicators for Message Identification) is a relatively new standard that displays your brand logo next to your emails in supported inboxes. Most domains do not have BIMI configured yet — it requires a DMARC policy of quarantine or reject, a verified brand logo in SVG format, and in some cases a Verified Mark Certificate (VMC). A BIMI warning is informational, not a deliverability problem. Focus on SPF, DKIM, and DMARC first.

Yes. Send a test campaign or test email from your ESP to the generated test address. The tool will analyze the email exactly as it arrives — including the ESP authentication headers, sending IP reputation, and content formatting. This is one of the best ways to verify that your ESP is properly configured, especially after setting up a custom sending domain or dedicated IP.

The Spam Word Checker analyzes your email text for trigger words — it is a content-level check that runs entirely in your browser. The Deliverability Tester analyzes a real email sent through real infrastructure — it checks your server authentication (SPF, DKIM, DMARC), sending IP reputation, blacklist status, header formatting, TLS encryption, and spam scoring. Think of it this way: the Spam Word Checker tests what you wrote, and the Deliverability Tester tests how it was sent.

Test results and email content auto-expire after one hour and are permanently deleted. We do not store, share, or analyze your email content beyond generating the deliverability report. The temporary test addresses are single-use and are deactivated after results are retrieved.