How do DNS errors contribute to throttling or retries?
Error types:
- NXDOMAIN: Domain does not exist (permanent failure)
- SERVFAIL: Server error (temporary, retry)
- Timeout: No response (temporary, retry)
Sender behavior:
- Temporary errors: Queue and retry (typically for hours to days)
- Permanent errors: Bounce immediately
- Repeated retries: May be throttled by receiver
Cascading effects:
- Many retries consume sender resources
- Receiving servers may rate-limit repeated attempts
- Queue buildup if DNS issues persist
Fix DNS errors promptly. Temporary errors are tolerated; persistent issues cause problems.
Registry errors cause repeated verification attempts. Persistent problems disrupt shipping schedules.
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