remove exim4 debian wheezy

Remove exim4 --the default MTA of debian wheezy-- from a debian wheezy GNU linux system

# apt-get --purge remove exim4-base exim4 exim4-config exim4-daemon-light
# cat /dev/null > /var/log/mail.err 
# cat /dev/null > /var/log/mail.info 
# cat /dev/null > /var/log/mail.log 
# cat /dev/null > /var/log/mail.warn




Remove exim4 from debian wheezy