Free email deliverability test. Enter a domain and get an instant deliverability score from a single check: SPF, DKIM, DMARC, MX records, and the major spam blocklists, all run in parallel from our London probe. Each category is graded pass, warning, or fail with a plain-language finding and a link to the full tool. The fastest way to see why your email lands in spam and what to fix first.
Deliverability is decided before a message reaches an inbox, at the DNS layer that receiving servers read to decide whether to trust you. This test runs the five checks that matter most in one pass: your SPF record (which servers may send as you), DKIM (the cryptographic signature on your mail), DMARC (the policy that ties the two together), your MX records (where inbound mail is routed), and whether your domain or sending IP sits on a major spam blocklist. Each category is graded pass, warning, or fail with a plain finding so you can see the weakest link at a glance.
A domain can have all the right records and still miss the inbox, because filters weigh alignment and reputation, not just presence. The most common silent failures are an SPF record that quietly exceeds ten DNS lookups, a DKIM signature that does not align with the visible From domain, and a DMARC policy left at p=none so nothing is enforced. Since 2024, Google and Yahoo require SPF, DKIM and DMARC from bulk senders outright, so a passing score is now a baseline rather than an optimization.
Use this test as a starting point: it tells you which category to open next. Each result links to the dedicated tool for that record, where you can see the full parse, follow every include, and confirm a fix before you push DNS changes.
It is a single check that scores the DNS and reputation signals receiving mail servers use to decide whether to trust your domain: SPF, DKIM, DMARC, MX records, and spam blocklist status. Each is graded pass, warning, or fail.
The usual causes are a missing or misconfigured SPF, DKIM, or DMARC record, a DKIM signature that does not align with your From domain, or a sending IP that is listed on a spam blocklist. This test flags which of those applies.
For bulk sending, yes. Since early 2024 Google and Yahoo require valid SPF, DKIM, and a DMARC policy from high-volume senders. Even for low volume, having all three greatly improves inbox placement.
No. Authentication is necessary but not sufficient. Sender reputation, content, engagement, and list hygiene also matter. A passing score removes the technical reasons for filtering, which is the part you control at the DNS level.
