EML files sitting in queue folder on SharePoint 2010 server

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SharePoint2010

Hi
i am sending email by below code but email are stuck in queue folder in server. i ve check using message box from address is showing correct email address. and also i am not getting any error also.

And i also see this link

http://social.technet.microsoft.com/Forums/sharepoint/en-US/924280ad-e7dc-4edc-9a88-5995a1675905/eml-files-sitting-in-queue-folder-on-sharepoint-2010-server?forum=sharepointadminprevious[^]

by placing eml files manually in drop folder and start and stop the smtp services but i m getting the same issue

by code is
string smtpServer =SPAdministrationWebApplication.Local.OutboundMailServiceInstance.Server.Address;
string smtpFrom = SPAdministrationWebApplication.Local.OutboundMailSenderAddress;
//Create the mail message and supply it with from and to info
MessageBox.Show("smtpfrom:"+smtpFrom.ToString());
MailMessage mailMessage = new MailMessage(smtpFrom, emailid);

//Set the subject and body of the message
mailMessage.Subject = subject;
mailMessage.Body = body;

//Download the content of the file with a WebClient
WebClient webClient = new WebClient();

//Supply the WebClient with the network credentials of our user
webClient.Credentials = CredentialCache.DefaultNetworkCredentials;
//Download the byte array of the file
byte[] data = webClient.DownloadData(attachementnomenutox);
//Dump the byte array in a memory stream because
//we can write it to our attachment
MemoryStream memoryStreamOfFile = new MemoryStream(data);

//Add the attachment
mailMessage.Attachments.Add(new System.Net.Mail.Attachment(memoryStreamOfFile, nomenutoxfilename));

//Create the SMTP client object and send the message
SmtpClient smtpClient = new SmtpClient(smtpServer);
smtpClient.Send(mailMessage);


Anyone see this issue

Thanks Manohar