What happens if TXT records overlap (e.g., multiple SPF entries)?
Overlapping TXT records have different effects:
Multiple SPF records: Explicitly forbidden. Results in permerror. Authentication fails for all mail.
Multiple DMARC records: Should be one record. Duplicates may cause parsing failure or unpredictable policy application.
Multiple DKIM selectors: Different selectors at different names is correct. Same selector name duplicated is problematic.
Non-email TXT records: Multiple TXT records for different purposes (Google verification, Facebook verification) coexist fine.
Detection: Use validation tools. They flag multiple SPF records as critical errors.
Filing duplicate registration forms creates confusion. One authoritative document per credential type.
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