All-in-one email
delivery toolkit
Debug SPF, DKIM, DMARC and DNS in seconds
Individual Tools
Need a specific check? Go deeper with a dedicated tool.
DNS Lookup
Query A, AAAA, MX, TXT, CNAME, NS, and SOA records.
DNS Propagation
Check if your DNS change has reached 12 global resolvers.
Blacklist Check
Check an IP or domain's MX servers against 14 DNSBLs.
WHOIS
Domain registration details, registrar info, and expiry dates.
DMARC
Check a domain's DMARC policy — none, quarantine, or reject.
SPF
View SPF records and count DNS lookups.
SPF Flattener
Resolve all includes into a single flat record with zero DNS lookups.
SSL Certificate
Check cert expiry, issuer chain, SANs, and TLS configuration.
Header Analyzer
Paste email headers to trace routing hops and auth results.
MX Inspector
Deep MX check — resolve IPs, verify PTR records, test port 25.
BIMI
Check brand logo record and VMC certificate for inbox display.
DKIM Lookup
Look up DKIM public keys by selector and check key strength.
PTR Lookup
Reverse DNS with forward confirmation — required for mail delivery.
TLS-RPT
Check SMTP TLS Reporting policy and where failure reports are sent.
MTA-STS
Verify MTA Strict Transport Security DNS record and policy file.
DMARC Report Reader
Paste or upload a DMARC aggregate XML report and see a readable breakdown.