What is the actual error you are getting?
Check whether your smtp server supports SSL and Authentication,
if (_ssl == "SSL")
{
smtpClient.EnableSsl = true;
}
else
{
smtpClient.EnableSsl = false;
}
if (_isauthenticate == "Yes")
{
smtpClient.UseDefaultCredentials = false;
credentials =
new System.Net.NetworkCredential(str_user, str_password);
smtpClient.Credentials = credentials;
}
else
{
smtpClient.UseDefaultCredentials = true;
credentials =
new System.Net.NetworkCredential();
smtpClient.Credentials = credentials;
}
Hope this helps.
cheers