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. It monitors SMTP port and blocks attackers IP addresses when the number of failed authentication attempts reaches the set limit. Check out the instructions below to learn how to enable and configure SMTP brute-force protection.

To enable SMTP brute-force protection

1. Start RdpGuard Dashboard and click Tools, Options


Click Tools, Options

2. RdpGuard Options dialog will appear, open the Monitoring tab


RdpGuard Monitoring Options

3. Check Enable SMTP protection

4. Click Save. RdpGuard service will be restarted.

SMTP brute-force protection Configuration

1. Click Tools, Options, Monitoring

2. Click the configure.. link:


Click the configure link

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:

  • Traffic based monitoring
  • Log based monitoring

Traffic based monitoring works with any SMTP servers, SSL/TLS connections are not supported.

Log based monitoring works with particular SMTP server's logs. SSL/TLS connections are supported.

Traffic based monitoring

The following traffic based monitoring methods are supported

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

SMTP port

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

Log based monitoring

Log based smtp monitoring

Log based SMTP Monitoring

Server type

The following SMTP servers are supported for now:

  • MailEnable
  • Kerio Connect
  • hMailServer

Log files directory

Specify log files directory used by selected SMTP server.

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