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pr cp 120644 r2

Debian 11 – Common Problem 094 – Fix & Prevention

๐ŸŸก Medium   โฑ 5โ€“30 min  Last verified: 20 May 2026 Affected versions: Debian 11 ๐Ÿ“– ~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 & […]

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pr cp 114569 r2

Postfix Cannot Send Mail Due To DNS Or Relay Policy

๐ŸŸก Medium   โฑ 5โ€“30 min  Last verified: 20 May 2026 ๐Ÿ“– ~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 & Cross-Refs References & Further […]

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pr cp 120136 r2

Debian 12 Postfix Queue Backlog Due to DNSBL Timeout

๐ŸŸก Medium   โฑ 5โ€“30 min  Last verified: 20 May 2026 Affected versions: Debian 12 ๐Ÿ“– ~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 & […]

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pr cp 122623 r2

FreeBSD 14: mail queue backlog grows due to DNS resolver timeout

๐ŸŸ  High   โฑ 5โ€“30 min  Last verified: 20 May 2026 Affected versions: FreeBSD 14 ๐Ÿ“– ~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 & […]

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pr cp 122119 r2

FreeBSD 15: sendmail queue growth from DNSBL lookup timeouts

๐ŸŸก Medium   โฑ 5โ€“30 min  Last verified: 20 May 2026 Affected versions: FreeBSD 15 ๐Ÿ“– ~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 & […]

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pr cp 123586 r2

FreeBSD 12: Postfix queue defers mail due to DNSSEC resolver timeouts

๐ŸŸ  High   โฑ 5โ€“30 min  Last verified: 19 May 2026 Affected versions: FreeBSD 12 ๐Ÿ“– ~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 & […]

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pr cp 123088 r2

FreeBSD 13: Postfix queue defers mail due to DNSSEC resolver timeouts

๐ŸŸ  High   โฑ 5โ€“30 min  Last verified: 19 May 2026 Affected versions: FreeBSD 13 ๐Ÿ“– ~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 & […]

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pr cp 120535 r2

Debian 11 – Common Problem 083 – Fix & Prevention

๐ŸŸก Medium   โฑ 5โ€“30 min  Last verified: 19 May 2026 Affected versions: Debian 11 ๐Ÿ“– ~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 & […]

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pr cp 111074 r2

Windows Server 2025 โ€” SMTP relay port 25 blocked by another service โ€” Fix & Prevention

๐ŸŸ  High   โฑ 5โ€“30 min  Last verified: 19 May 2026 Affected versions: Windows Server 2025 ๐Ÿ“– ~2 min read Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution โ€” Primary Fix Solution โ€” Alternative Approaches Verification & Acceptance Criteria Rollback Plan Prevention & Hardening Related Errors […]

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pr cp 114062 r2

Postfix relay denied by SELinux policy

๐ŸŸ  High   โฑ 5โ€“30 min  Last verified: 20 May 2026 Affected versions: RHEL 10.0 RHEL 10.1 ๐Ÿ“– ~1 min read Table of contents Problem Summary Symptoms Diagnostics Root Cause Primary Fix Verification Prevention Rollback Automation Command Reference Escalation Related Notes Problem Summary Mail relay attempts fail due to SELinux denials in postfix context. Symptoms […]

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