Error codes

SPF too many lookups

SPF evaluation must stop at 10 DNS-querying terms. Past that, the result is permerror. The message is not a soft fail.

The terms that count are include, a, mx, ptr, exists, and the redirect modifier, including lookups those mechanisms cause. all, ip4, and ip6 do not. Void lookups, a name that does not exist or an empty answer, have a separate limit: implementations should stop at two, and exceeding that is also permerror.