Security new user CRASH

Hi! when try add user in the security menu on new application the blank screen this:

Fatal error: Uncaught exception ‘Swift_TransportException’ with message ‘Expected response code 250 but got code “”, with message “”’ in C:\Program Files (x86)\NetMake\v7\wwwroot\scriptcase\prod hird\swift\classes\Swift\Transport\AbstractSmtpTransport.php:422 Stack trace: #0 C:\Program Files (x86)\NetMake\v7\wwwroot\scriptcase\prod hird\swift\classes\Swift\Transport\AbstractSmtpTransport.php(306): Swift_Transport_AbstractSmtpTransport->_assertResponseCode(’’, Array) #1 C:\Program Files (x86)\NetMake\v7\wwwroot\scriptcase\prod hird\swift\classes\Swift\Transport\EsmtpTransport.php(224): Swift_Transport_AbstractSmtpTransport->executeCommand(‘RSET??’, Array, Array) #2 C:\Program Files (x86)\NetMake\v7\wwwroot\scriptcase\prod hird\swift\classes\Swift\Transport\Esmtp\Auth\LoginAuthenticator.php(50): Swift_Transport_EsmtpTransport->executeCommand(‘RSET??’, Array) #3 C:\Program Files (x86)\NetMake\v7\wwwroot\scriptcase\prod hird\swift\classes\Swift\Transport\Esmtp\AuthHandler.php(170): Swift_Transport_Esmtp_Auth_LoginAuthent in C:\Program Files (x86)\NetMake\v7\wwwroot\scriptcase\prod hird\swift\classes\Swift\Transport\AbstractSmtpTransport.php on line 422

please help!

Hello,

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regards,
Bernhard Bernsmann