How can multiple TXT records conflict?
TXT record conflicts depend on the protocol:
SPF: Only one SPF record allowed per domain. Multiple SPF records = permerror. Authentication fails.
DKIM: Each selector is a different DNS name. No conflict unless duplicate selectors exist.
DMARC: Only one DMARC record at _dmarc.domain. Duplicates may cause parsing errors.
Common mistakes:
- Adding new SPF instead of editing existing one.
- Keeping old ESP's SPF after migration.
- Copy-paste errors creating duplicates.
Prevention: Always check existing records before adding. Edit rather than add for SPF.
Two conflicting navigation charts for the same harbor. Ships cannot determine which is authoritative.
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