Tools
Direct checks driven by a domain name — no signup, no email required. Each tool states plainly what only a real message can reveal.
SPF SPF Record Lookup DNS-Lookup
Checks syntax, lookup limit and the all qualifier of an SPF record.
DMARC DMARC Record Lookup DNS-Lookup
Policy, alignment, reporting and external report authorization.
BL Blacklist Check DNSBL
Domain against 6 domain BLs, mail server IPs against 25 DNSBLs.
MX MX Record Lookup DNS + SMTP
MX records, rDNS/FCrDNS, STARTTLS, certificate and DANE.
What the tools cannot see
Every tool here works with what DNS publishes. Whether SPF passes for a specific message, whether the DKIM signature is valid, which IP you actually send from and what the TLS path looks like — only a real email reveals that.
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