XF 1.3 Email Not Sending

[JahgDohg]

Error Info:
Zend_Mail_Transport_Exception: Email to gu*u.*n**lo@s***ent.****ols.net failed: Unable to send mail. - library/Zend/Mail/Transport/Sendmail.php:137

Stack Trace:
#0 /home/gta5kqax/public_html/Gamerscommunity.us/library/Zend/Mail/Transport/Abstract.php(348): Zend_Mail_Transport_Sendmail->_sendMail()
#1 /home/gta5kqax/public_html/Gamerscommunity.us/library/Zend/Mail.php(1194): Zend_Mail_Transport_Abstract->send(Object(Zend_Mail))
#2 /home/gta5kqax/public_html/Gamerscommunity.us/library/XenForo/Mail.php(177): Zend_Mail->send()
#3 /home/gta5kqax/public_html/Gamerscommunity.us/library/XenForo/Mail.php(152): XenForo_Mail->sendMail(Object(Zend_Mail))
#4 /home/gta5kqax/public_html/Gamerscommunity.us/library/XenForo/Model/UserConfirmation.php(136): XenForo_Mail->send('g********elo@stu...', 'JahgDohg')
#5 /home/gta5kqax/public_html/Gamerscommunity.us/library/XenForo/ControllerPublic/AccountConfirmation.php(103): XenForo_Model_UserConfirmation->sendEmailConfirmation(Array)
#6 /home/gta5kqax/public_html/Gamerscommunity.us/library/XenForo/FrontController.php(347): XenForo_ControllerPublic_AccountConfirmation->actionResend()
#7 /home/gta5kqax/public_html/Gamerscommunity.us/library/XenForo/FrontController.php(134): XenForo_FrontController->dispatch(Object(XenForo_RouteMatch))
#8 /home/gta5kqax/public_html/Gamerscommunity.us/index.php(13): XenForo_FrontController->run()
#9 {main}

Request State:
#0 /home/gta5kqax/public_html/Gamerscommunity.us/library/Zend/Mail/Transport/Abstract.php(348): Zend_Mail_Transport_Sendmail->_sendMail()
#1 /home/gta5kqax/public_html/Gamerscommunity.us/library/Zend/Mail.php(1194): Zend_Mail_Transport_Abstract->send(Object(Zend_Mail))
#2 /home/gta5kqax/public_html/Gamerscommunity.us/library/XenForo/Mail.php(177): Zend_Mail->send()
#3 /home/gta5kqax/public_html/Gamerscommunity.us/library/XenForo/Mail.php(152): XenForo_Mail->sendMail(Object(Zend_Mail))
#4 /home/gta5kqax/public_html/Gamerscommunity.us/library/XenForo/Model/UserConfirmation.php(136): XenForo_Mail->send('g**u.*****lo@stu...', 'JahgDohg')
#5 /home/gta5kqax/public_html/Gamerscommunity.us/library/XenForo/ControllerPublic/AccountConfirmation.php(103): XenForo_Model_UserConfirmation->sendEmailConfirmation(Array)
#6 /home/gta5kqax/public_html/Gamerscommunity.us/library/XenForo/FrontController.php(347): XenForo_ControllerPublic_AccountConfirmation->actionResend()
#7 /home/gta5kqax/public_html/Gamerscommunity.us/library/XenForo/FrontController.php(134): XenForo_FrontController->dispatch(Object(XenForo_RouteMatch))
#8 /home/gta5kqax/public_html/Gamerscommunity.us/index.php(13): XenForo_FrontController->run()
#9 {main}

 

[TPerry]

Using the php functions or SMTP? If SMTP then it may be an authentication problem. If php functions then you need to check your MTA logs.