Fatal during installation

I'm not sure how to get the rest but here is the last bit of the log file:

Configuration file `/etc/apache2/mods-available/xml2enc.load', does not exist o$ Installing new config file as you requested.

Configuration file `/etc/apache2/ports.conf', does not exist on system. Installing new config file as you requested.

Configuration file `/etc/apache2/sites-available/000-default.conf', does not ex$ Installing new config file as you requested.

Configuration file `/etc/apache2/sites-available/default-ssl.conf', does not ex$ Installing new config file as you requested.

Configuration file `/etc/bash_completion.d/apache2', does not exist on system. Installing new config file as you requested.

Configuration file `/etc/cron.daily/apache2', does not exist on system. Installing new config file as you requested.

Configuration file `/etc/default/apache2', does not exist on system. Installing new config file as you requested.

Configuration file `/etc/init.d/apache2', does not exist on system. Installing new config file as you requested.

Configuration file `/etc/logrotate.d/apache2', does not exist on system. Installing new config file as you requested. Enabling module mpm_event. Enabling module authz_core. Enabling module authz_host. Enabling module authn_core. Enabling module auth_basic. Enabling module access_compat. Enabling module authn_file. Enabling module authz_user. Enabling module alias. Enabling module dir. Enabling module autoindex. Enabling module env. Enabling module mime. Enabling module negotiation. Enabling module setenvif. Enabling module filter. Enabling module deflate. Enabling module status. Enabling conf charset. Enabling conf localized-error-pages. Enabling conf other-vhosts-access-log. Enabling conf security. Enabling conf serve-cgi-bin. Enabling site 000-default. Setting up mailman (1:2.1.18-2+deb8u1) ...

Configuration file `/etc/cron.d/mailman', does not exist on system. Installing new config file as you requested.

Configuration file `/etc/init.d/mailman', does not exist on system. Installing new config file as you requested.

Configuration file `/etc/logrotate.d/mailman', does not exist on system. Installing new config file as you requested.

Configuration file `/etc/mailman/apache.conf', does not exist on system. Installing new config file as you requested. Looking for enabled languages (this may take some time) ... done. Installing site language en ............................................ done. Configuring mailman for domain server.localdomain ... Upgrading from version 0x0 to 0x20112f0 getting rid of old source files Setting up libapache2-mod-php5 (5.6.27+dfsg-0+deb8u1) ...

Configuration file `/etc/apache2/mods-available/php5.conf', does not exist on s$ Installing new config file as you requested.

Configuration file `/etc/apache2/mods-available/php5.load', does not exist on s$ Installing new config file as you requested.

Creating config file /etc/php5/apache2/php.ini with new version php5_invoke: Enable module opcache for apache2 SAPI php5_invoke: Enable module pdo_mysql for apache2 SAPI php5_invoke: Enable module json for apache2 SAPI php5_invoke: Enable module readline for apache2 SAPI php5_invoke: Enable module pdo for apache2 SAPI php5_invoke: Enable module mysqli for apache2 SAPI php5_invoke: Enable module mysql for apache2 SAPI Module mpm_event disabled. Enabling module mpm_prefork. apache2_switch_mpm Switch to prefork apache2_invoke: Enable module php5 Processing triggers for libc-bin (2.19-18+deb8u6) ... Processing triggers for systemd (215-17+deb8u5) ... Errors were encountered while processing: postfix postfix-pcre FATAL - 2016-11-02 10:46:07 - Fatal Error Occurred: Something went wrong during$ FATAL - 2016-11-02 10:46:07 - Cannot continue installation. FATAL - 2016-11-02 10:46:07 - Attempting to remove virtualmin repository config$ FATAL - 2016-11-02 10:46:07 - re-attempted after any problems have been resolve$ FATAL - 2016-11-02 10:46:07 - Removing temporary directory and files. FATAL - 2016-11-02 10:46:07 - If you are unsure of what went wrong, you may wis$ FATAL - 2016-11-02 10:46:07 - in /root/virtualmin-install.log