Free Mail Tester: Email Deliverability & Spam Score Checker

An email deliverability test analyzes your email message, sender authentication (SPF, DKIM, DMARC), server reputation, and content quality to predict whether your emails will reach the inbox or be filtered as spam. It gives you a score and actionable recommendations.

We generate a unique email address for each test. You send an email to this address from your real sending infrastructure. Our system then analyzes the received email’s headers, authentication records, content, and checks your IP against 23+ blacklists. Results are ready in seconds.

Yes, completely free with no signup required. You can run unlimited tests. We offer this as a community tool to help improve email deliverability across the industry.

Your score ranges from 0 to 100. A score of 90+ (grade A) means excellent deliverability. 70–89 (grade B) is good but has room for improvement. Below 70 (grade C or lower) indicates issues that may cause your emails to land in spam. Each check includes specific fix recommendations.

Start by fixing any failed authentication checks (SPF, DKIM, DMARC). Then resolve any blacklist listings, ensure proper reverse DNS, and optimize your email content. Our report provides specific, actionable fix instructions for each issue found.

SPF (Sender Policy Framework) specifies which servers can send email for your domain. DKIM (DomainKeys Identified Mail) adds a cryptographic signature to verify message integrity. DMARC (Domain-based Message Authentication) ties SPF and DKIM together with a policy that tells receivers how to handle authentication failures. All three are essential for good deliverability.

Send a test email to the unique address we provide. Our system runs the same checks that major email providers use (spam filtering, authentication verification, blacklist lookups) and tells you exactly what issues may cause spam folder placement.

An inbox placement test checks whether your emails reach the inbox, the spam folder, or get blocked entirely. SendBridge analyzes authentication (SPF, DKIM, DMARC), sender reputation, blacklist status, and content signals to predict where your message will land at major providers like Gmail, Outlook, and Yahoo.

The most frequent email deliverability issues include missing or misaligned SPF, DKIM, and DMARC records, poor sender reputation, IP or domain blacklisting on RBLs like Spamhaus, missing reverse DNS (PTR) records, spammy content or subject lines, and broken List-Unsubscribe headers. Our mail tester identifies each of these issues with specific fix recommendations.

SendBridge offers unlimited free tests (mail-tester.com limits free users to 3/day), includes Rspamd analysis in addition to standard checks, provides embeddable score badges, and has a modern, mobile-friendly interface. Both tools are valuable — we simply offer more for free.

Yes! You can test from any email source — Gmail, Outlook, Mailchimp, SendGrid, Amazon SES, your own SMTP server, or any other email provider. Simply send an email to the test address from whatever system you want to check.

We analyze your email for scoring purposes but do not permanently store the email body, subject line, or full sender address. Public report pages only show technical results (authentication, DNS, blacklists) and your sending domain. Test data is automatically deleted after 7 days.