This explains how to use Spamassassin to remove a lot of the spam that is sent as emails.
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Prerequisites
Ensure sendmail is working for send and receiving mail externally
Spamassassin RPM needs to be installed
Procmail RPM needs to be installed
Configuration
vi /etc/mail/spamassassin/local.cf
vi /etc/procmailrc
For each user create procmail log file
# touch $HOME/Procmail/pmlog
Testing
# tail -f $HOME/Procmail/pmlog