yum install spamassassin spamass-milter
yum install perl-Mail-SPF perl-Mail-DKIM perl-Razor-Agent pyzor poppler-utils re2c
chkconfig spamassassin on
chkconfig spamass-milter on
service spamassassin start
service spamass-milter start
vi sendmail.mc

INPUT_MAIL_FILTER(`spamassassin', `S=unix:/var/run/spamass-milter/spamass-milter.sock, F=, T=C:15m;S:4m;R:4m;E:10m')dnl
define(`confMILTER_MACROS_CONNECT',`t, b, j, _, {daemon_name}, {if_name}, {if_addr}')dnl
define(`confMILTER_MACROS_HELO',`s, {tls_version}, {cipher}, {cipher_bits}, {cert_subject}, {cert_issuer}')dnl

make
/etc/init.d/sendmail restart
spamassassin -D < /usr/share/doc/spamassassin-3.3.1/sample-spam.txt 2>&1|grep -i spf

$ diff -u spamd.org /usr/sbin/spamd
--- spamd.org	2011-04-21 23:35:10.000000000 +0000
+++ /usr/sbin/spamd	2011-04-22 00:11:17.000000000 +0000
@@ -1593,7 +1593,10 @@

   my $scantime = sprintf( "%.1f", time - $start_time );

-  info("spamd: $was_it_spam ($msg_score/$msg_threshold) for\
  $current_user:$> in"
+  my @from_addrs = $mail->get_pristine_header("Received");
+  join("\n",@from_addrs) =~ m/(\[\d+\.\d+\.\d+\.\d+\])/;
+  my $from_addr = $1;
+  info("spamd: $was_it_spam ($msg_score/$msg_threshold) from\
  $from_addr for $current_user:$> in"
        . " $scantime seconds, $actual_length bytes." );

   # add a summary "result:" line, based on mass-check format

# Fail2Ban filter for spamass-filter failures
#

[INCLUDES]

before = common.conf

[Definition]

failregex = spamd: identified spam .* from \[<HOST>\]

ignoreregex =

# DEV Notes:
#
# Author:

cat /etc/sysconfig/spamass-milter

### Standard parameters for spamass-milter are:
### -f -P /var/run/spamass-milter.pid
### These run the milter as a daemon and have it write a PID file
###
### You may add another parameters here, see spamass-milter(1)
EXTRA_FLAGS="-r 6"