Monitoring Logfiles on Windows

Log Mail Notification

What does the program do?

Log Mail Notification (LMN) is a Windows service that automatically monitors log files on Windows and sends immediate email notifications when defined text patterns are detected. The goal is to inform administrators and IT teams early about security‑relevant, technical, or operational events—without having to manually search through log files.

 

How does the monitoring work?

  • LMN regularly reads the specified log files on Windows.
  • You define which text strings should be searched for (e.g., error messages, warnings, “FATAL”, “ERROR”, “Unauthorized”).
  • As soon as such an entry is found, LMN creates a detailed email containing all important information:
    • Log file name
    • Detected log entry
    • Timestamp
    • Computer name and domain
    • Original content from the log file

 

Example 1: Web server or security monitoring

You want to ensure that security‑relevant messages from IIS, Apache, or software logs are detected immediately.
Configuration:

  • File: C:\inetpub\logs\LogFiles\W3SVC1\u_ex*****.log
  • String: "401" or "Forbidden"
  • Interval: check every 10 minutes

Result:
LMN sends an email:

Subject: Security alert in log file on SERVER01 Details: - Log file: u_ex240101.log - Timestamp: 28.12.2025 14:32 - Computer: SERVER01
- Match: 401 - Unauthorized Access

 

Example 2: Application error monitoring

A software application does not write its messages to the Event Log but instead stores them exclusively in its own log file.
Configuration:

  • File: C:\ProgramData\MyApp\logs\error.log
  • String: "FATAL"
  • Interval: check every 5 minutes

Result:
LMN sends an email:

Subject: Application error on CLIENT05 Details: - Timestamp: 28.12.2025 09:15 - Computer: CLIENT05
- Match: FATAL - Database connection failed

 

Key benefits

  • Individual string monitoring: You define exactly which log entries are relevant.
  • Flexible usage: Works with all text‑based log files on Windows.
  • Secure communication: Email delivery via SMTP with TLS.
  • Multilingual: German and English.
  • Easy installation: Runs as a Windows service with optional silent installation for multiple systems.
  • Long‑term monitoring: Ideal for compliance, analysis, and security‑related oversight.

 

Ideal for

  • System administrators who want to detect error messages immediately.
  • IT departments that need to monitor log files from various applications.
  • Companies that want to receive security‑relevant log entries automatically via email.

 

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