All-in-one email
delivery toolkit
Debug SPF, DKIM, DMARC and DNS in seconds
One tool to check your domain — MX, SPF, DKIM, and DMARC in a single run.
Individual Tools
Email authentication
SPF, DKIM, DMARC — the records inboxes check before they trust you.
DMARC
Check a domain's DMARC policy — none, quarantine, or reject.
SPF
View SPF records and count DNS lookups.
DKIM Lookup
Look up DKIM public keys by selector and check key strength.
BIMI
Check brand logo record and VMC certificate for inbox display.
DMARC Report Reader
Paste or upload a DMARC aggregate XML report and see a readable breakdown.
Deliverability
Fix the issues that send mail to spam or get your IP blocked.
SPF Flattener
Resolve all your senders into one hosted include — one DNS lookup instead of ten.
MTA-STS
Verify MTA Strict Transport Security DNS record and policy file.
TLS-RPT
Check SMTP TLS Reporting policy and where failure reports are sent.
PTR Lookup
Reverse DNS with forward confirmation — required for mail delivery.
Blacklist Check
Check an IP or domain's MX servers against 14 DNSBLs.
DNS & diagnostics
Everything else — lookups, propagation, certificates, headers.
DNS Lookup
Query A, AAAA, MX, TXT, CNAME, NS, and SOA records.
DNS Propagation
Check if your DNS change has reached 12 global resolvers.
MX Inspector
Deep MX check — resolve IPs, verify PTR records, test port 25.
WHOIS
Domain registration details, registrar info, and expiry dates.
Header Analyzer
Paste email headers to trace routing hops and auth results.
SSL Certificate
Check cert expiry, issuer chain, SANs, and TLS configuration.
Zone File
Generate a BIND-format zone file for any domain from its public DNS records.