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A comment on How to prevent email spoofing, using an unholy combination of silly standards. Parent comment
If your spf is too heavy, add universal spf and then watch it work by either sending a test message or rechecking your spf with https://vamsoft.com/support/tools/spf-policy-tester
If your spf is too heavy, add universal spf and then watch it work by either sending a test message or rechecking your spf with https://vamsoft.com/support/tools/spf-policy-tester