"Syntax error, command unrecognized" Error when sending email using the System.Net.Mail.MailMessage and System.Net.Mail.SMTPClient class RRS feed

  • Question

  • I am trying to Send Email using the System.Net.Mail.MailMessage and System.Net.Mail.SMTPClient class. It gives me the following error:

    Syntax error, command unrecognized. The server response was: recipients flow control, try later at System.Net.Mail.RecipientCommand.CheckResponse(SmtpStatusCode statusCode, String response) at System.Net.Mail.SmtpTransport.SendMail(MailAddress sender, MailAddressCollection recipients, String deliveryNotify, SmtpFailedRecipientException& exception)

    What can be the possible causes for this error. 


    Pankaj Bajpai. Prosares Solutions ASP.Net | Sharepoint | Consulting SharePoint | ASP.Net | Business Intelligence
    Wednesday, May 4, 2011 11:34 AM