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XF 1.4 Xenforo 1.4.0 Beta Email Cant be sent

When I try to Register I get this error in the Server Logs

Error Info
Zend_Mail_Transport_Exception: Email to [blocked] failed: Unable to send mail. - library/Zend/Mail/Transport/Sendmail.php:137
Generated By: aelbourne, 3 minutes ago
Stack Trace
#0 /var/www/html/library/Zend/Mail/Transport/Abstract.php(348): Zend_Mail_Transport_Sendmail->_sendMail()
#1 /var/www/html/library/Zend/Mail.php(1194): Zend_Mail_Transport_Abstract->send(Object(Zend_Mail))
#2 /var/www/html/library/XenForo/Mail.php(175): Zend_Mail->send(Object(Zend_Mail_Transport_Sendmail))
#3 /var/www/html/library/XenForo/Mail.php(152): XenForo_Mail->sendMail(Object(Zend_Mail))
#4 /var/www/html/library/XenForo/Model/UserConfirmation.php(170): XenForo_Mail->send('alexander.merce...', 'xH3LLRAIZ3Rx')
#5 /var/www/html/library/XenForo/ControllerAdmin/User.php(912): XenForo_Model_UserConfirmation->processUserModeration(Array, 'approve', true, '')
#6 /var/www/html/library/XenForo/FrontController.php(347): XenForo_ControllerAdmin_User->actionModeratedUpdate()
#7 /var/www/html/library/XenForo/FrontController.php(134): XenForo_FrontController->dispatch(Object(XenForo_RouteMatch))
#8 /var/www/html/admin.php(13): XenForo_FrontController->run()
#9 {main}
Request State
array (size=3)
'url' => string 'http://aelborne.com/admin.php?users/moderated/update' (length=52)
'_GET' =>
array (size=1)
'users/moderated/update' => string '' (length=0)
'_POST' =>
array (size=2)
'users' =>
array (size=1)
2 =>
array (size=2)
'_xfToken' => string '********' (length=8)


XenForo developer
Staff member
This is very likely just an indication of an issue with the mail system on your server. You would need root (or your host's) help to resolve it most likely, or you should send mail via SMTP.


XenForo developer
Staff member
You need to setup a mail transfer agent such as Postfix and ensure that PHP is configured to use it correctly (sendmail_path).