PROBLEM
Libra Esva upgrade script from version 3.0.1.0 to 3.1 fails to download update package clamd and Libra Esva stops processing mails.
SOLUTION
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Copy and Paste the followings:
yum upgrade clamd -y /usr/bin/sudo /bin/sed -i "s/DatabaseDirectory \/var\/clamav/DatabaseDirectory \/var\/lib\/clamav/" /etc/freshclam.conf /usr/bin/sudo /bin/sed -i "s/DatabaseDirectory \/var\/clamav/DatabaseDirectory \/var\/lib\/clamav/" /etc/clamd.conf /usr/bin/sudo /bin/sed -i "s/User clam\b/User clamav/" /etc/clamd.conf chown -R clamav:clamav /var/run/clamav/ chown -R clamav:clamav /var/lib/clamav/ /usr/bin/sudo /bin/sed -i "s/\/var\/clamav/\/var\/lib\/clamav/" /usr/local/sbin/scripts/freshclam /usr/bin/sudo /bin/sed -i "s/create 644 clam clam/create 644 clamav clamav/" /etc/logrotate.d/freshclam /usr/bin/sudo /bin/sed -i "s/create 644 clam clam/create 644 clamav clamav/" /etc/logrotate.d/clamav /usr/bin/freshclam /etc/init.d/clamd start /etc/init.d/MailScanner restart