Email Authentication

Free SPF Checker

Validate your SPF record, DNS lookup count, mechanisms, and sender reputation readiness before business outreach.

Basic SPF report is free

Get SPF status, lookup count, policy strength, top issues, and recommendations. Create a free account to unlock the full fix guide.

You can paste a URL. DevBoxy will normalize it before checking DNS.

This checks public DNS records only. It does not require domain ownership or expose private infrastructure.
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SPF validation guide

Validate SPF before scaling business communication

SPF tells receiving systems which services can send email for your domain. A clean SPF record supports email authentication, domain health, and deliverability readiness.

DevBoxy checks SPF records, policy strength, risky mechanisms, provider includes, and the DNS lookup limit so agencies and B2B teams can fix configuration issues before they affect sender reputation.

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Domain Health Checker DKIM Checker DMARC Checker MX Checker Blacklist Checker Email Header Analyzer