“Authentication failed” error in sending Mail Asp.Net

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i am using VS2010(Frame work 4.0) and SQL 2012 , we are using exchange server....same mail configuration is working in java application but not working in c#

button click code is :

try
{
SmtpClient smtp = new SmtpClient();
smtp.Host = "mail.myorganization.com"
smtp.Port = "587";
smtp.Credentials = new System.Net.NetworkCredential("abc@myorganization.com", "password");
smtp.DeliveryMethod = SmtpDeliveryMethod.Network;
smtp.EnableSsl = true;
MailMessage msg = new MailMessage();
msg.From = new MailAddress("abc@myorganization.com");
msg.To.Add(new MailAddress("receiver@something.com"));
msg.Subject = "Test";
msg.Body = "Test mail";
smtp.Timeout = 60000;
smtp.Send(msg);
result = true;
}
catch (Exception ex)
{

}
My exception error is

System.Net.Mail.SmtpException was caught
HResult=-2146233088
Message=Authentication failed.
Source=System
StackTrace:
at System.Net.Mail.SmtpConnection.GetConnection(ServicePoint servicePoint)
at System.Net.Mail.SmtpTransport.GetConnection(ServicePoint servicePoint)
at System.Net.Mail.SmtpClient.GetConnection()
at System.Net.Mail.SmtpClient.Send(MailMessage message)
at MailConfiguration.TestMail() in

Posted 12-Oct-15 0:58am

kiran kumar

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Krunal Rohit 12-Oct-15 7:07am

And the error is ?

[Haven't seen the exception. Apologies]

-KR

kiran kumar 12-Oct-15 8:08am

error is "Authentication failed"

kiran kumar 18-Nov-15 8:03am

host\port\credentials\ssl settings all are correct. I used same credentials in java application. It is working in Java App, but failed in failed in .Net App. Any help ??

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F-ES Sitecore · Answer 1 · 2015-10-12T01:07:00

Solution 1

Set UseDefaultCredentials to false before you set the Credentials property

https://msdn.microsoft.com/en-us/library/system.net.mail.smtpclient.usedefaultcredentials(v=vs.110).aspx[^]

Posted 12-Oct-15 1:07am

F-ES Sitecore

Comments

kiran kumar 12-Oct-15 7:15am

Thanks for your reply. smtp.UseDefaultCredentials = false; i used this but no use, mail sending failed.

F-ES Sitecore 12-Oct-15 7:24am

Check with your network admin to ensure the host\port\credentials\ssl settings are all correct. For example if you use SSL then the port might be 465, there is no point in guessing though, and we can't know how your smtp server is configured, you'll need to ask the people that know.

kiran kumar 12-Oct-15 7:49am

i tried with port number 465. mail sending failed.

kiran kumar 18-Nov-15 8:03am

host\port\credentials\ssl settings all are correct. I used same credentials in java application. It is working in Java App, but failed in failed in .Net App. Any help ??