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Type the following command under Debian / Ubuntu Linux:

  sudo apt-get install ssmtp

Configure mailserver as a smarthost

  sudo nano /etc/ssmtp/ssmtp.conf
  
  AuthUser=piadmin@walker-web.co.uk
  AuthPass=kipperwantsomechilli
  FromLineOverride=YES
  mailhub=mail.quickmail.co.uk:143
  UseSTARTTLS=YES

Also, make sure you disable Sendmail:

  service sendmail stop
  chkconfig sendmail off
  mkdir /root/.bakup
  mv /usr/sbin/sendmail /root/.bakup
  ln -s /usr/local/ssmtp/sbin/ssmtp /usr/sbin/sendmail