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Too many empty SPF lookups

…Warning · Reason code: void_lookup_limit_exceeded

What it means

Section titled “What it means”

While evaluating your SPF record, more than two DNS lookups returned no record. These are called void lookups. The SPF standard allows at most two, so receiving servers may treat your SPF as a permanent error and fail it. SPF also allows at most 10 lookups in total (include, a, mx, ptr, exists, redirect).

Fix

Section titled “Fix”
  • Remove include: entries that point to names that no longer exist.
  • Remove include: entries for services you no longer use.
  • Replace ptr; it’s slow and discouraged.
  • If you still need many senders, ask each provider whether a narrower include exists.