How can DKIM selector errors create intermittent failures?
Selector mismatch:
- Messages signed with selector not in DNS
- DKIM fails because key not found
- Can happen during key rotation
Intermittent causes:
- Multiple sending systems with different selectors
- Key rotation mid-process
- Load balancer routing to different configs
- DNS propagation during changes
Symptoms:
- DKIM passes sometimes, fails others
- Inconsistent authentication results
- Confusion about what is wrong
Diagnosis:
- Check DKIM-Signature header for selector used
- Verify that selector exists in DNS
- Check all sending paths
Ship using credentials not registered at some ports. Verify all credentials match all routes.
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