[ Free toolkit ]
Free email authentication tools.
Check DMARC, SPF, DKIM, BIMI, MTA-STS and DANE, inspect DNS and mail servers, test reputation, then generate records and analyze reports. 27 tools, no signup.
[ Email Authentication ]
Validate DMARC, SPF, DKIM, BIMI, MTA-STS and DANE, or run every check at once.
Full Domain Health Scan
Run every email security check at once and get one score.
Open toolDMARC Checker
Look up and explain any domain's live DMARC record.
Open toolSPF Checker
Validate your SPF record and check the 10-lookup limit.
Open toolDKIM Lookup
Verify a DKIM selector is published and the key is valid.
Open toolBIMI Record Checker
Check a BIMI record and whether the logo will actually display.
Open toolMTA-STS & TLS-RPT Checker
Check your TLS policy record, policy file and TLS reporting.
Open toolDANE / TLSA Checker
Check DNSSEC-signed TLSA records that lock down SMTP TLS.
Open toolGoogle & Yahoo Sender Check
Pass/fail against the Gmail and Yahoo bulk-sender rules.
Open tool[ DNS & Mail Servers ]
Inspect the DNS records and mail servers your authentication depends on.
MX Lookup
See a domain's mail servers and whether the setup is valid DNS.
Open toolNameServer Checker
List a domain's nameservers and catch lame or single-point-of-failure DNS.
Open toolSOA Record Checker
Grade your zone's serial, refresh, retry, expire and negative TTL.
Open toolA & AAAA Lookup
See IPv4 and IPv6 addresses for a domain and its www host.
Open toolCNAME Lookup
Follow a CNAME chain and catch a dangling target before someone else does.
Open toolCAA Record Checker
See which certificate authorities may issue TLS certs for you.
Open toolDNS Propagation Checker
Look up any record across Cloudflare, Google and AliDNS side by side.
Open tool[ Reputation & Security ]
Spot blocklistings, reverse DNS gaps, young domains and impersonation risks.
Blacklist & DNSSEC Checker
Check your mail server IPs on spam blocklists and see DNSSEC status.
Open toolReverse DNS (PTR) Checker
Check PTR records and forward-confirmed reverse DNS for sending IPs.
Open toolDomain Age & RDAP Lookup
See when a domain was registered, when it expires and if it's locked.
Open toolLookalike Domain Finder
Find typo and homoglyph domains that could impersonate you.
Open tool[ Generators ]
Build valid records, keys, logos and IP ranges ready to publish.
DMARC Generator
Build a valid _dmarc TXT record with guided options.
Open toolSPF Generator
List your sending sources and generate a correct v=spf1 record.
Open toolSPF Flattener
Turn includes into IP ranges to get under the 10-lookup limit.
Open toolSPF CIDR Calculator
Work out an IP range and the exact ip4:/ip6: SPF mechanism.
Open toolDKIM Record Generator
Generate a DKIM key pair and the TXT record to publish, in your browser.
Open toolBIMI SVG Converter
Convert your logo SVG to the Tiny-PS format BIMI requires.
Open tool[ Analyzers ]
Read DMARC reports and raw message headers locally.