Debian 13 – Postfix Queue Deferred by DNS Resolution Errors – Mail Flow Repair
🟠 High ⏱ 5–30 min Last verified: 16 August 2025 Affected versions: Debian 13 (Trixie) 📖 ~1 min read Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & Acceptance Criteria Rollback Plan Prevention & Hardening Related Errors […]