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

[Freakinfreak]

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"
}
}

 

[TPerry]

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

You missed the top portion of the stack trace.. and by chance, are you using a Google gmail account?

 

[Freakinfreak]

You missed the top portion of the stack trace.. and by chance, are you using a Google gmail account?

Zend_Mail_Protocol_Exception: Email to xxx@xxx.com failed: Incorrect authentication data - library/Zend/Mail/Protocol/Abstract.php:431

I'm using mailgun. I don't see any errors being generated on the logs from there.

 

[TPerry]

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.

 

[Paul B]

See point 8 here: https://xenforo.com/community/resources/email-troubleshooting-guide.5086/update?update=18730

If it has started happening suddenly with no changes made by you, then you may want to contact your SMTP provider.

 

[Freakinfreak]

I've tried changing the smtp settings to a different provider as well and having the same issues.

 

[Paul B]

Contact your host then.

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

 

[Mike Edge]

Contact your host then.

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

Nothing was changed by us either and MailGun is working for others on the server.