Home/Tools/DNSDNSDNS lookup and diagnostics for MX, SPF, DKIM, DMARC, and reverse DNS.Reading time: 3 minDifficulty: BeginnerEstimated duration: 3 minPrerequisites: NoneLast updated: July 2026Author: EmpireRelated learningDNSDomain Name System — the lookup fabric email authentication depends on.SPFSender Policy Framework — authorizes hosts that may send for a domain.Related problemsGmail spam folderMail authenticated for your domain is accepted by Gmail but filed to Spam.Domain reputation degradedAuthenticated domain identity is treated as untrusted despite IP changes.Related toolsMXToolboxPopular DNS and mail diagnostics suite for SPF, DMARC, blacklist, and MX checks.digCLI DNS lookup utility for authoritative and recursive inspection of mail-related records.Cloudflare DNSAuthoritative DNS hosting commonly used to publish SPF, DKIM, DMARC, and MX records.WorkflowsOpen step-by-step: Configure SPFPublish and validate an SPF policy for authorized senders.Open step-by-step: Diagnose authentication failuresTrace SPF/DKIM/DMARC failures to a remediable cause.Open step-by-step: Verify DNS recordsVerify zone authority, MX/address records, and authentication-related TXT publications.Open step-by-step: Recover from Gmail spamExit Gmail Spam using Postmaster signals, authentication fixes, and controlled volume.Open step-by-step: Migrate authentication recordsMove SPF, DKIM, and DMARC to a new platform without dual-record failures.Continue LearningInbox PlacementSeed-based and continuous tools for measuring inbox versus spam placement.PreviousEmail ValidationNextInbox Placement