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

Start RdpGuard Dashboard and click on the link next to SMTP

smtp protection link

SMTP Protection Link in RdpGuard Dashboard

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
  • MS-Exchange

Log files directory

Specify log files directory used by selected SMTP server.

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