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XF 1.5 Zend_Mail_Protocol_Exception: Email to xxx@xxx.com failed (after retry): Incorrect authentic

#1
I didn't make any changes to the SMTP settings and this just started happening.

Stack Trace

#0 /home/mysite/public_html/library/Zend/Mail/Protocol/Smtp/Auth/Login.php(95): Zend_Mail_Protocol_Abstract->_expect(235)
#1 /home/mysite/public_html/library/Zend/Mail/Protocol/Smtp.php(217): Zend_Mail_Protocol_Smtp_Auth_Login->auth()
#2 /home/mysite/public_html/library/Zend/Mail/Transport/Smtp.php(217): Zend_Mail_Protocol_Smtp->helo('localhost')
#3 /home/mysite/public_html/library/Zend/Mail/Transport/Abstract.php(348): Zend_Mail_Transport_Smtp->_sendMail()
#4 /home/mysite/public_html/library/Zend/Mail.php(1194): Zend_Mail_Transport_Abstract->send(Object(Zend_Mail))
#5 /home/mysite/public_html/library/XenForo/Model/MailQueue.php(91): Zend_Mail->send(Object(Zend_Mail_Transport_Smtp))
#6 /home/mysite/public_html/library/XenForo/Deferred/MailQueue.php(10): XenForo_Model_MailQueue->runMailQueue(7.99999809265)
#7 /home/mysite/public_html/library/XenForo/Model/Deferred.php(295): XenForo_Deferred_MailQueue->execute(Array, Array, 7.99999809265, '')
#8 /home/mysite/public_html/library/XenForo/Model/Deferred.php(429): XenForo_Model_Deferred->runDeferred(Array, 7.99999809265, '', false)
#9 /home/mysite/public_html/library/XenForo/Model/Deferred.php(374): XenForo_Model_Deferred->_runInternal(Array, NULL, '', false)
#10 /home/mysite/public_html/deferred.php(23): XenForo_Model_Deferred->run(false)
#11 {main}

Request State

array(3) {
["url"] => string(37) "http://mysite.com/deferred.php"
["_GET"] => array(0) {
}
["_POST"] => array(4) {
["_xfRequestUri"] => string(37) "/index.php?threads/hello-from-la.552/"
["_xfNoRedirect"] => string(1) "1"
["_xfToken"] => string(8) "********"
["_xfResponseType"] => string(4) "json"
}
}
 

Tracy Perry

Well-known member
#4
Check the authentication data, make sure nothing is wrong with your mailgun account and make sure that none of their required settings (port #, TLS/SSL) have changed.
 

Brogan

XenForo moderator
Staff member
#7
Contact your host then.

Something must have changed for it to suddenly stop working without any changes being made by you.