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How to Enable Multiple PHP in NodeWorx and SiteWorx
June 21, 2017
Displaying Messages in Outlook
October 11, 2017

How to Enable Tarpitting to Reduce Spam

Published by InterWorx on August 23, 2017

Tarpitting is when a server identifies a client’s abnormal email operations, and slows down or “tarpits” the process, preventing spam. For more information: https://www.techopedia.com/definition/1722/tarpitting

With tarpitting enabled, if a sender attempts to issue commands to the mail server before the banner, the connection is dropped:

[[email protected] ~]# telnet test.corp.interworx.com 25
Trying 10.1.16.999...Connected to test.corp.interworx.com.
Escape character is '^]'
HELO test
554 SMTP protocol violation
Connection closed by foreign host.

Set Up:

To enable tarpitting, follow these steps:

1. At the command line, use the text editor to view /etc/tcprules.d/tcp.smtp. It will look similar to the following:

Tarpitting 1

2. At the end of the line beginning with :allow, add the following: ,GREETDELAY="5",DROP_PRE_GREET="1"

Tarpitting 2

3. Run ~vpopmail/bin/clearopensmtp

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