m-dns.org
Why is your mail not arriving?
Type a domain. Read the MX, SPF, DKIM and DMARC records at once. Try the spam score and SMTP login in their own tools.
Featured tools
All tools
DNS Lookup
Full record set for a domain
MX Lookup
Mail exchange records
DNSSEC Validator
DS and DNSKEY presence
DNS Propagation
Worldwide resolver view
DNS Generator
BIND and Cloudflare output
Domain Analysis
DNS, WHOIS and reputation
WHOIS
Registration record
SMTP Tester
Banner and port reachability
Mail spam score test
Measure your email spam score and see what to fix
IP Lookup
PTR and WHOIS
Port Checker
Common public ports
SSL Checker
Certificate dates and SAN
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