Mail Services

How to Use Reliability Monitor on Windows Server 2016 — step-by-step Windows Server 2016 tutorial on Progressive Robot

How to Use Reliability Monitor on Windows Server 2016 (SERVER-2016-2)

How to Configure Windows Reliability Monitor on Windows Server 2016 Windows Reliability Monitor is a built-in diagnostic tool in Windows Server 2016 that tracks system stability over time and presents a graphical timeline of critical events such as application crashes, Windows failures, hardware errors, and software installations. Unlike Performance Monitor, which focuses on metrics, Reliability […]

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How to Configure FSRM File Server Resource Manager on Windows Server 2019 — step-by-step Windows Server 2019 tutorial on Progressive Robot

How to Configure FSRM File Server Resource Manager on Windows Server 2019

Introduction to File Server Resource Manager on Windows Server 2019 File Server Resource Manager (FSRM) is a role service for Windows Server 2019 that provides comprehensive management of file server storage. It enables administrators to set storage quotas on volumes and folders, create file screening policies to block prohibited file types, generate storage usage reports, […]

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Common Problems 115549

RHEL 7 Postfix queue growth due to DNS and firewalld egress restrictions

🟡 Medium   ⏱ 5–30 min  Last verified: 11 August 2021 Affected versions: RHEL 7 📖 ~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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How to Install and Configure Dovecot IMAP Server on RHEL 7 — step-by-step RHEL 7 tutorial on Progressive Robot

How to Install and Configure Dovecot IMAP Server on RHEL 7

How to Install and Configure Dovecot IMAP Server on RHEL 7 Dovecot is a secure, high-performance IMAP and POP3 server that integrates seamlessly with Postfix on RHEL 7. While Postfix handles the transport of mail (sending and receiving via SMTP), Dovecot provides the retrieval layer — allowing mail clients such as Thunderbird, Outlook, or Apple […]

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How to Install Netdata on RHEL 7 — step-by-step RHEL 7 tutorial on Progressive Robot

How to Install Netdata on RHEL 7

How to Install Netdata on RHEL 7 Netdata is a real-time performance monitoring agent that delivers per-second metrics with zero configuration on most Linux systems. Unlike heavier monitoring solutions that scrape on 15-second or 1-minute intervals, Netdata collects and stores data every second, making it ideal for diagnosing transient performance problems that would be invisible […]

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Common Problems 125144

Oracle Linux 8 – Common Problem 018 – Diagnosis and Fix

🟡 Medium   ⏱ 5–30 min  Last verified: 24 July 2021 Affected versions: Oracle Linux 8 📖 ~3 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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Common Problems 115603

RHEL 7 – Postfix Service Starts but Mail Queue Never Drains

🟡 Medium   ⏱ 5–30 min  Last verified: 18 May 2021 📖 ~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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How to Configure System Center Operations Manager (SCOM) Agent on Windows Server 2012 R2 — Windows Server 2012 R2 tutorial on Progressive Robot

How to Configure System Center Operations Manager (SCOM) Agent on Windows Server 2012 R2

How to Configure System Center Operations Manager (SCOM) Agent on Windows Server 2012 R2 System Center Operations Manager (SCOM) 2012 R2 provides enterprise-grade monitoring for Windows Server 2012 R2 environments. The SCOM agent, installed on each managed server, collects health state data, performance counters, event log entries, and application-specific metrics, then transmits them to the […]

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How to Configure Desired State Configuration (DSC) on Windows Server 2012 R2 — step-by-step Windows Server 2012 R2 tutorial on Progressive Robot

How to Configure Desired State Configuration (DSC) on Windows Server 2012 R2

How to Configure Desired State Configuration (DSC) on Windows Server 2012 R2 PowerShell Desired State Configuration (DSC) is a management platform introduced in PowerShell 4.0 that allows administrators to define the intended state of a server — which Windows features are installed, which services are running, which files exist, and how the system is configured […]

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Common Problems 115109

RHEL 8 – Postfix Mail Queue Stalls from DNS Resolver Problems

🟡 Medium   ⏱ 5–30 min  Last verified: 12 March 2021 📖 ~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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