Single SPF policy
A domain should publish one SPF record; multiple records can cause a permanent authentication error.
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Validate the SPF policy that authorizes mail servers to send for your domain.
SPF is a DNS TXT policy listing the services allowed to send email for a domain. A correct record reduces spoofing and delivery failures.
Check SPF whenever you add a newsletter, CRM, helpdesk or transactional email provider.
Three signals that matter most when interpreting this tool.
A domain should publish one SPF record; multiple records can cause a permanent authentication error.
Every legitimate email platform must be included directly or through an include mechanism.
The ending all mechanism defines how unauthorized senders are treated; -all is strictest.
SPF is evaluated against the envelope sender and sending IP. Each include, a, mx, exists or redirect mechanism can trigger DNS work, and the standard limits evaluation to ten DNS lookups. Oversized policies and multiple SPF records are common reasons legitimate messages fail authentication.
List every platform that sends as your domain—including business mail, website forms, billing systems and marketing services—then consolidate them into one record. Pair the finished policy with DKIM and DMARC so forwarded mail and visible From-domain alignment are handled correctly.
Email authentication works as a system rather than as isolated records. SPF identifies permitted senders, DKIM proves message integrity and DMARC evaluates alignment against the visible From domain. A technically valid record can still produce poor deliverability if another part of the authentication chain is incomplete.
Use this tool before and after adding a mail platform, CRM, billing application or marketing sender. Keep a record of every authorized source and remove obsolete services so your domain policy stays understandable.
Found a configuration problem or planning your next deployment? These HostGraber services are the most relevant next steps for this tool.
Provide the domain, IP address, workload, server specification or calculator inputs requested by the tool.
HostGraber validates the input and processes the request using the appropriate DNS, network, SSL or calculation logic.
Review the output, copy it when needed, compare related checks and use the linked HostGraber resources for the next step.
Clear answers for common spf checker questions.
No. Combine all senders into one policy to avoid PermError results.
SPF evaluation permits at most ten DNS-triggering mechanisms. Exceeding it can make authentication fail.
No. Pair SPF with DKIM and DMARC so receivers can check alignment and enforce a clear policy.
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