Is it normal to HAVE to set the sendmail_path in php.ini with centOS to get it to work with nginx/php-fpm to send mail out? I've just finished a few hours battling with an individuals server that runs centOS 6.x and had used Centmin version 1.2.2 and installed the MariaDB 5.2.x (which does NOT work with Postfix since PostFix requires the mysql-lib's). Installed the Centmin 1.2.3 and it offers an upgrade to 5.5. Ran it and all it did was REMOVE 5.2 and never installed 5.5. Had to update to MariaDB 5.5 via YUM manually, then install postfix. Still would not work from xenForo (and neither would the smtp setup). Once I finally figured out that maybe I needed to set the sendmail_path to the /usr/lib/sendmail-postfix (which I did) did it start working. I'm used to Debian - where there are no hoop-jumping like the above required. Install your DB flavor of choice, install nginx, install php5-fpm and related, install postfix and then fine tune (but it works without having to remove sendmail, update the MariaDB, etc, etc.).