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Using Location Services on macos Without Wifi

Keep Ethernet as the active connection while macOS scans nearby Wi‑Fi beacons for geolocation. Disabling Auto Join on saved networks prevents unwanted wireless failover without sacrificing Location Services.

Postfix basic install and DKIM violence.

A default Postfix fallback can rewrite 8-bit mail after DKIM signing, leaving downstream verifiers chasing mysterious body-hash failures. The incident is a practical warning to support 8BITMIME/SMTPUTF8 and inspect every hop that can transform a signed message.

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