* The POSIX module of PHP needs to be activated (e.g. [RHEL, CentOS](http://www.bigsoft.co.uk/blog/index.php/2014/12/08/posix-php-commands-not-working-under-centos-7) have disabled it)
* some form of email server or email gateway such that PHP mail() works
* MySQL 5.6+ or an equivalent alternative for MySQL (MariaDB, Percona Server etc.)
* The POSIX module of PHP needs to be activated (e.g. [RHEL, CentOS](http://www.bigsoft.co.uk/blog/index.php/2014/12/08/posix-php-commands-not-working-under-centos-7) have disabled it)
* some form of email server or email gateway such that PHP mail() works
* MySQL 5.6+ or an equivalent alternative for MySQL (MariaDB, Percona Server etc.)