Resolve the RFC 7208 10-lookup limit with recursive DNS flattening. Ensure 100% deliverability and sub-5ms resolution for complex enterprise infrastructures.
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The Authorization Checklist
SPF is essentially a public list of IPs and services that are allowed to send email for you. If a sender isn't on the list, their email is rejected.
Standard SPF records are limited to 10 DNS lookups. When you add services like SendGrid, Google, and HubSpot, you exceed this limit instantly. SentraDMARC hosts your SPF record via CNAME, dynamically flattening it to stay within RFC limits permanently.
SPF records are strict. A single typo invalidates the entire record. We check for common syntax errors and typos.
You only get 10 DNS lookups per SPF check. Exceeding this makes your record invalid. We count them for you.
Ensure your IP ranges are correctly formatted (CIDR notation) and actually point to the servers you intend to authorize.