SPF has no all mechanism

Check id: spf.all_missing · fix effort: low

What it means

Your SPF record lists allowed senders but never says what to do about everyone else. Unknown senders pass by default.

The technical detail

No terminal all mechanism and no redirect=. Evaluation defaults to neutral for unmatched sources.

How to fix it

  1. Append ~all (or -all once confident) to the record.

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