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Guides from the NOC

Written from running the hardware — what breaks, why, and the command that fixes it.

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Domains SPF Permerror: Fix 'Too Many DNS Lookups' Once and for All

Getting an SPF permerror because your DNS record has too many nested lookups? Here's how to count, flatten, and fix it fast without breaking mail.

19 July 2026 · 6 min