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Here i am facing problem during email send via rediffmail smtp client. Here email send properly using gmail and webmail(

Following is my code.....

MailMessage Message = new MailMessage();
Message.IsBodyHtml = true;
string to=txtCustEmail.Text;
string from = txtYourEmail.Text;
string password = txtPass.Text;

Message.To.Add(new MailAddress(to));
Message.From = (new MailAddress(from, "ADMIN"));
Message.Subject = txtMsgSub.Text;
Message.Body = txtMsgBody.Text;
Message.Attachments.Add(new Attachment("D:\\Excise2.xlsx"));

NetworkCredential NetworkCred = new NetworkCredential(from, password);

SmtpClient sc =new SmtpClient();
if (radioButton1.Checked==true)
   sc = new SmtpClient("");
if (radioButton2.Checked==true)
     sc = new SmtpClient("");
if (radioButton3.Checked == true)
    sc = new SmtpClient("");
sc.Port = 587;

sc.Credentials = NetworkCred;
sc.EnableSsl = true;

MessageBox.Show("Email send to " + Message.To);


Email send Properly through gmail and logix but not for even my rediffmail credential are correct.It shows following exception

SmtpException was handled...Failure sending mail.

Please help me........
aarif moh shaikh 31-Dec-15 0:23am
change sc.Port=25;
SujataJK 31-Dec-15 0:39am
already changed still not working i gives following exception
InvalidOperationException ....The SMTP Host is not specified
Richard MacCutchan 31-Dec-15 4:14am
Use your debugger to find out why the client is not being set. You could also add code to check that you have a valid client after all the if statements. Although that would mean rewriting that portion of code better.
SujataJK 31-Dec-15 0:41am
thanks for your early reply
SujataJK 31-Dec-15 5:23am
I used debugger and also rewrite code then also same issue.
Also I used in separate program still same issue.

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