Free DNS, SSL and email tools
Tools that help you check the configuration of your services.
Mail SSL check
Test IMAP, POP3 and SMTP. Check the certificate, TLS encryption and STARTTLS support on seven ports.
SSL/TLSSTARTTLS7 ports
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Websites and security
Website SSL check
Check a website HTTPS certificate on port 443: validity, name match, TLS version and encryption.
SSL/TLSHTTPSport 443
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Domains and DNS
DNS propagation
Check whether a DNS record change is already visible in public resolvers: A, AAAA, CNAME, MX, TXT, NS and SOA.
DNS5 resolversTTL
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Email and DNS
MX Lookup
See which servers accept mail for a domain, in what order and at which IP addresses.
MXPrioritiesIP
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Email
Email headers
Paste message headers to see the delivery path and SPF, DKIM and DMARC results. Analysis runs in your browser.
SPFDKIMDMARC
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