From http://www.simplemachines.org/community/index.php?topic=446074.0 Hi everyone, when installing SMF 2.0 on RHEL6 recently, I found that emails were not being sent, with the error Code: [Select] sendmail: fatal: chdir /var/spool/postfix: Permission denied showing up in /var/log/httpd/error_log. This was caused by the apache user not having SELinux permission to send email. This could also occur on other distributions which use SELinux (particularly Fedora and CentOS, but possibly others as well), if it is set to "Enforcing". You can check this by using Code: [Select] /usr/sbin/getsebool httpd_can_sendmail which will report Code: [Select] httpd_can_sendmail --> {on|off} and if it is off, you can turn it on using Code: [Select] sudo setsebool -P httpd_can_sendmail 1 with the "-P" for persistent (across reboots). Important note, it can look like it's doing nothing, but it actually is. It will come back in about 1 minute