There are a couple of options you can choose from for spam filtering. 

1. You can install the Spamassassin application via your control panel. (instructions shown below and it is included in your VDS).

2. Hardhat also offers an enterprise level spam filtering service.  Please call us at 866 HardHat (866 427-3428) or open a sales ticket at https://www.hardhathosting.com/helpdesk/ to request pricing.

To install the Spamassassin Value Application:

Go into your Value Apps or Applications/Install & Manage section. Under the Collaboration section, click on the SpamAssassin link.

Agree to the terms and Click Finish if the settings are what you want.  Most just click Finish. Once installed, you can manage the application using the Launch Application link - you will need to login using your control panel ID and password.

SpamAssassin will rewrite the subject line of every email that it suspects is unsolicited email. Then you can use your favorite email software message rules to move the email to its own SPAM Folder.

After you install SpamAssassin replace the /etc/mail/spamassassin/local.cf with the following file. 1 is true and 0 is false. If a line has the # symbol at the front, it will be ignored. You can find out more about these settings or create your own local.cf file here: http://www.yrex.com/spam/spamconfig.php

# SpamAssassin config file for version 2.5x
# generated by http://www.yrex.com/spam/spamconfig.php (version 1.01)

# How many hits before a message is considered spam.
required_hits           5.0

# Whether to change the subject of suspected spam
rewrite_subject         1

# Text to prepend to subject if rewrite_subject is used
subject_tag             *****SPAM*****

# Encapsulate spam in an attachment
report_safe             1

# Use terse version of the spam report
use_terse_report        0

# Enable the Bayes system
use_bayes               1

# Enable Bayes auto-learning
auto_learn              1

# Enable or disable network checks
skip_rbl_checks         0
#use_razor2              1
#use_dcc                 1
#use_pyzor               1

# Mail using languages used in these country codes will not be marked
# as being possibly spam in a foreign language.
ok_languages            all

# Mail using locales used in these country codes will not be marked
# as being possibly spam in a foreign language.
ok_locales              all