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Validate your SPF records and email authentication configuration. Ensure authorized servers can send emails on your domain's behalf.
SPF (Sender Policy Framework) records are DNS entries that specify which mail servers are authorized to send emails from your domain. They help prevent email spoofing and improve deliverability by allowing receiving servers to verify legitimate senders.
DNS publication
You publish a TXT record listing authorized sending sources.
Email verification
Receiving servers check if the sender is in your SPF record.
Policy enforcement
Unauthorized emails are handled per your policy (~all, -all, etc).
Prevents spoofing
Makes it harder for attackers to forge emails from your domain.
Improves deliverability
Legitimate emails are more likely to reach the inbox.
Domain protection
Protects your domain reputation from abuse by spammers.
An SPF (Sender Policy Framework) record is a DNS TXT record that lists all the IP addresses and mail servers authorized to send email on behalf of your domain. It helps prevent email spoofing and improves deliverability.
Simply enter your domain name (e.g., company.com) into the InboxKit SPF Checker tool and click 'Check SPF Record'. We will analyze your DNS records and report on your SPF configuration validity.
A soft fail (~all) tells receiving servers to accept emails from unauthorized IPs but mark them as suspicious or potential spam. This is the recommended setting for most domains as it prevents legitimate emails from being rejected outright while still offering protection.
Common reasons for invalid SPF records include: exceeding the 10 DNS lookup limit, syntax errors, multiple SPF records (you can only have one), or missing required mechanisms. Our tool provides detailed error messages to help you fix these issues.
InboxKit provides complete email infrastructure with automated SPF, DKIM, and DMARC setup
