Email sending Problem

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ASP.NET

Dear All,
i have a problem that my code is not working properly,
if domail is www.abc.com then working and if domain is www.abc.in then not working,

My code is as below.

MailMessage msgMail = new MailMessage();
            msgMail.From = new MailAddress(txtEmail.Text);
            msgMail.To.Add("xyz@abc.in");
            msgMail.Subject = "Query";
            msgMail.IsBodyHtml = true;
            msgMail.Body = "I am Boy"
            SmtpClient client = new SmtpClient("email.abc.in";);
            client.Credentials = new NetworkCredential("info@abc", "dkr@123");
            client.Send(msgMail);





Please help as soon as possible.


thanks
Dharmendra