About This Tool
A mail deliverability test tells you whether the email you send will actually reach the inbox, or get filtered to spam or rejected outright. Rather than guessing, you send one real message from the address you want to test to a private, one-time address, and this tool reads the message we receive and grades it the same way a receiving mail server would. It checks the three pillars of email authentication (SPF, DKIM, and DMARC alignment), inspects the sending IP for proper reverse DNS and forward-confirmed reverse DNS, queries the major DNS blacklists that mailbox providers consult, and audits message hygiene such as a valid Message-ID, a plain-text alternative, a Return-Path, and a List-Unsubscribe header on bulk mail. The result is a single score out of 10 plus a specific fix for every item that would hurt your deliverability.
How to Use
Open the tool to get your private one-time test address. Copy it, then send any email to it from the mailbox or application you want to test (your real sending address). Come back to the page and click Check Score. The tool waits for your message to arrive, then displays your score out of 10 along with a breakdown of every check as a pass, warning, or fail, each with a plain-language fix. It can take up to a minute for mail to arrive, and each test address is private to you and expires after a short window.
Tips & Best Practices
Send the test from the exact system you use in production (your website, CRM, newsletter platform, or transactional provider), because SPF and DKIM depend on the specific server and headers that system produces. The biggest wins are almost always the same three items: get SPF to pass with an aligned Return-Path, enable DKIM signing with a signing domain that aligns with your From address, and publish a DMARC record so alignment is enforced. If your sending IP has no reverse DNS or is on a blacklist, fix that before anything else, because it can override everything else. Re-run the test after each DNS or configuration change to confirm the fix landed.
