sudo debconf-set-selections <<-EOF
postfix postfix/main_mailer_type select No configuration
EOF
-"$tool"/local/apt-get-install postfix procmail postfix-pcre
+"$tool"/local/apt-get-install postfix procmail postfix-pcre postfix-policyd-spf-perl
"$tool"/local/insserv-remove postfix
sudo install -m 640 -o root -g root /dev/stdin /etc/postfix/.gitignore <<-EOF