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#243 Legacy E-Mail trifft Sicherheit: SPF, DKIM, DMARC, ARC

Engineering Kiosk

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SPF‑DNS‑Einträge und Fail‑Modi

Wolfgang erläutert DNS‑TXT SPF‑Einträge, erlaubte Server sowie Hard‑ und Soft‑Fail‑Unterschiede.

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