XF 1.2 Server Error Log: Incorrect authentication data

[JordanH]

Hello.
It has come to me that new users registering on the site now with update 1.2.3 does not get the emails to confirm registration.

here is what the server error log says:

Zend_Mail_Protocol_Exception: Incorrect authentication data - library/Zend/Mail/Protocol/Abstract.php:431
Generated By: Unknown Account, Today at 1:10 AM
Stack Trace
#0 /home/webgurub/public_html/library/Zend/Mail/Protocol/Smtp/Auth/Login.php(95): Zend_Mail_Protocol_Abstract->_expect(235)
#1 /home/webgurub/public_html/library/Zend/Mail/Protocol/Smtp.php(217): Zend_Mail_Protocol_Smtp_Auth_Login->auth()
#2 /home/webgurub/public_html/library/Zend/Mail/Transport/Smtp.php(200): Zend_Mail_Protocol_Smtp->helo('localhost')
#3 /home/webgurub/public_html/library/Zend/Mail/Transport/Abstract.php(348): Zend_Mail_Transport_Smtp->_sendMail()
#4 /home/webgurub/public_html/library/Zend/Mail.php(1194): Zend_Mail_Transport_Abstract->send(Object(Zend_Mail))
#5 /home/webgurub/public_html/library/XenForo/Mail.php(177): Zend_Mail->send()
#6 /home/webgurub/public_html/library/XenForo/Mail.php(152): XenForo_Mail->sendMail(Object(Zend_Mail))
#7 /home/webgurub/public_html/library/XenForo/Model/UserConfirmation.php(136): XenForo_Mail->send('amzimmer2013@gm...', 'Teg')
#8 /home/webgurub/public_html/library/XenForo/ControllerPublic/Register.php(303): XenForo_Model_UserConfirmation->sendEmailConfirmation(Array)
#9 /home/webgurub/public_html/library/*******/Credits/ControllerPublic/Register.php(18): XenForo_ControllerPublic_Register->actionRegister()
#10 /home/webgurub/public_html/library/XenForo/FrontController.php(337): *******_Credits_ControllerPublic_Register->actionRegister()
#11 /home/webgurub/public_html/library/XenForo/FrontController.php(134): XenForo_FrontController->dispatch(Object(XenForo_RouteMatch))
#12 /home/webgurub/public_html/index.php(13): XenForo_FrontController->run()
#13 {main}

any help?

 

[Amaury]

May be an issue with your host; try contacting it.

 

[JordanH]

May be an issue with your host; try contacting it.

I host it on my own servers.
I have never had the problem before.

 

[Russ]

Looks like a potential problem with:

******* Credits

 

[Jeremy]

Are you using SMTP? Verify your credentials.