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https://www.dagorret.com.ar/el-servidor-perfecto-ubuntu-18-04-nginx-mysql-php-postfix-bind-dovecot-pure-ftpd-e-ispconfig-3-1/
El servidor perfecto : Ubuntu 18.04 (Nginx, MySQL, PHP, Postfix, BIND, Dovecot, Pure-FTPD e ISPConfig 3.1)