postconf -e daemon_directory='/usr/lib/postfix/sbin’
postconf -e shlib_directory='/usr/lib/postfix'
daemon_directory
causes Postfix cannot start.shlib_directory
causes Postfix cannot find pcre/mysql/pgsql/ldap modules.NOTE: This step is toally optional if you're fine with old PHP release.
php was not upgraded to 7.0 automatically, have to install them manually:
apt-get install php-json php-gd php-mcrypt php-curl mcrypt php-intl php-xml php-mbstring php-mysql libapache2-mod-php