When I am trying to send mail while developing webservice, it
succeeds.but when I publish and upload webservice ,It gives excepttion
that "Failure sending mail"..
Thank you in advance

It gives excepttion
that "Failure sending mail"..

This code works fine when developing and testing application, but
doesn't work after deploying..

source code:

[WebMethod]
public Boolean SendMail(string Username, string Password, string
To, string Subject, string Body)
{

SendMailFunction(MailFrom, ToMailId, MailSubject, Mailbody,
IsBodyHtml, CredentialName, CredentialPassWord);


return true;
}

private void SendMailFunction(string MailFrom, string ToMailId, string
MailSubject, string Mailbody, bool IsBodyHtml, string CredentialName,
string CredentialPassWord)
{
System.Net.Mail.MailMessage ObjMailMessage = new
System.Net.Mail.MailMessage();
SmtpClient Client = new SmtpClient();

MailAddress From = new MailAddress(CredentialName);
Client.Credentials = new System.Net.NetworkCredential
(CredentialName, CredentialPassWord);
ObjMailMessage.To.Add(ToMailId);
ObjMailMessage.From = From;
ObjMailMessage.Subject = MailSubject;

ObjMailMessage.SubjectEncoding = System.Text.Encoding.UTF8;
ObjMailMessage.BodyEncoding = System.Text.Encoding.UTF8;

ObjMailMessage.Body = Mailbody;
ObjMailMessage.IsBodyHtml = IsBodyHtml;
Client.Host = "smtp server";

Client.EnableSsl = false;

// Client.Port = 80;

try
{
Client.Send(ObjMailMessage);
}
catch (System.Net.Mail.SmtpException ex)
{
throw new Exception(ex.Message);
}
}

Thanks in advance