How to Enable and Configure SMTP Brute-Force Protection. SMTP Server Protection.
Intrusion prevention system for your Windows Server

SMTP Brute-Force Protection

Protection Overview

RdpGuard helps you protect your SMTP server from brute-force attacks by monitoring the SMTP port or logs for failed authentication attempts. When the number of failed attempts reaches the set limit, RdpGuard blocks the attacker's IP address. Check out the instructions below to learn how to enable and configure SMTP brute-force protection.

To Enable and Configure SMTP Protection

Start RdpGuard Dashboard and click on the link next to SMTP

smtp protection link

SMTP Protection Link in RdpGuard Dashboard

The SMTP Settings dialog will open:

smtp detection engine settings

SMTP Detection Engine Settings

Monitoring method for SMTP protocol

The following monitoring methods are supported for SMTP protocol:

Log based monitoring

The default option recommended for SMTP monitoring is through Logs. This method involves monitoring SMTP server logs and is more efficient in terms of resource usage compared to monitoring network traffic. Moreover, it also works for SSL/TLS connections and supports detection of usernames.

SMTP Server

The following SMTP servers are supported for now:

Log files directory

Specify log files directory used by selected SMTP server.

Traffic based monitoring

Another option for monitoring SMTP is through traffic. This method can be used with any SMTP server, but requires more resources compared to monitoring through logs. Please also note that SSL/TLS connections and username detection is not supported.

Traffic based SMTP monitoring

SMTP Monitoring via Traffic

The following traffic based monitoring methods are supported

  • WinPcap - Works on all Windows Editions, WinPcap must be installed.
  • Raw Sockets - Does not work on Windows Server 2008 or with firewalls.

SMTP port

You may specify multiple comma-separated ports for SMTP traffic monitoring.

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