Email authentication

bitobmen.net SPF validation

Cached SPF record analysis for this domain.

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SPF validation

Record found

Invalid SPF record

Query name

bitobmen.net

Terminal all

none

DNS lookup count

SPF record count

SPF record

v=spf1 redirect=_spf.mailhostbox.com

Errors

invalid mechanism syntax: redirect=_spf.mailhostbox.comSPF record has no mechanisms after v=spf1

Warnings

no explicit all mechanism at the end of the record

Recommendations

end the record with -all or ~all to define default handlingpair with DMARC Analyzer and DKIM Validator before tightening mail authentication enforcement

Tool switcher

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Same target (bitobmen.net) — open the next tool without retyping.

Email Auth CheckerSame targetRun SPF, DMARC, and DKIM checks in one auditbitobmen.netOpen
DMARC AnalyzerSame targetDMARC policy, alignment and reporting checksbitobmen.netOpen
DKIM ValidatorSame targetDKIM selector lookup and record validationbitobmen.netOpen
DNS CheckerSame targetAll major record types in one passbitobmen.netOpen
DIGSame targetOne record type, resolver-style answerbitobmen.netOpen
Domain IP LookupSame targetA and AAAA IP addresses for a domainbitobmen.netOpen
Domain Age CheckerSame targetCreation date, age, registrar and expirybitobmen.netOpen
WHOISSame targetRegistrar, expiry and domain statusbitobmen.netOpen
HTTP Header CheckerSame targetResponse headers, redirects and cachingbitobmen.netOpen
HTTP/2 TesterSame targetHTTP/2 support, ALPN and TLS negotiationbitobmen.netOpen
SSL Certificate CheckerSame targetCertificate chain, SAN and TLS versionbitobmen.netOpen
CAA Record CheckerSame targetCheck CAA DNS records, authorized CAs, issuewild and iodefbitobmen.netOpen
Blacklist CheckerSame targetDNSBL reputation for IP and domainbitobmen.netOpen
Punycode ConverterSame targetUnicode ↔ Punycode for IDN domainsbitobmen.netOpen
URL SplitterSame targetBreak a URL into parts and query paramshttps://bitobmen.net/Open
Base64 CodecEncode and decode Base64 textOpen
Password GeneratorStrong random passwords for ops workOpen
Password Strength CheckerEntropy, crack time and password suggestionsOpen
Passphrase GeneratorMemorable random word phrases for safer sharing testsOpen
BIN CheckerCard brand, bank and country from BIN/IINOpen
IP CalculatorSubnet math for IPv4 and IPv6 CIDROpen
Browser Update CheckerBrowser version, update status and Client HintsOpen

Full tool catalog →

Guides

Practical guides for common SPF Validator tasks — DNS records, troubleshooting steps, and links to our free tools.

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Shareable SPF validator result pages. SPF authorizes mail senders through a single v=spf1 TXT record published at the domain apex, not at _dmarc or DKIM selectors. DN01 returns parsed mechanisms, lookup estimates, warnings, and a shareable result URL for the same domain after DNS changes.
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SPF validation

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Related articles

SPF TXT record basics at the domain apex

Include mechanisms and third-party senders

Terminal all qualifiers: pass, fail, softfail, neutral

SPF DNS lookup limit and flattening

SPF alignment with DMARC enforcement

Shareable SPF validator result pages