SMTP error: "Client does not have permission to submit mail to this server"

Posted by Raj Kumar on Stack Overflow See other posts from Stack Overflow or by Raj Kumar
Published on 2010-05-10T05:32:35Z Indexed on 2010/05/10 5:44 UTC
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c#

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smtp

I'm getting the following error while sending email. What could be the cause?

Client does not have permission to submit mail to this server. The server response was: 5.5.1 STARTTLS may not be repeated.

Here's the stack trace...

Stack Trace

at System.Net.Mail.StartTlsCommand.CheckResponse(SmtpStatusCode statusCode, String response) at System.Net.Mail.StartTlsCommand.Send(SmtpConnection conn) at System.Net.Mail.SmtpConnection.GetConnection(String host, Int32 port) at System.Net.Mail.SmtpTransport.GetConnection(String host, Int32 port) at System.Net.Mail.SmtpClient.GetConnection() at System.Net.Mail.SmtpClient.Send(MailMessage message)

I'm connecting to smtp.gmail.com with SSL on port 587 / 465

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