How do mail filters cache DNS data for spam analysis?
Why filters cache:
- Processing millions of messages
- Same DNS lookups repeated constantly
- Caching improves performance
Cache duration:
- May follow TTL
- May use internal cache policies
- Some cache longer for efficiency
Implications:
- SPF/DKIM changes may not take effect immediately at all receivers
- Reputation data may lag DNS changes
- Blocklist removal may take time to propagate
Planning:
- Allow time after authentication changes before expecting full effect
- Do not assume instant propagation
Port authorities may use their own record copies. Updates take time to reach all offices.
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