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Can't send email from web application

Posted By:      Posted Date: September 21, 2010    Points: 0   Category :ASP.Net

 I get error when sending email from web app:

 The server rejected one or more recipient addresses.
The server response was: 451 Greylisted,
 please try again in 900 seconds

I have very simple contact us page to send inquiry email.Following is the code behind file

protected void btnImage_Click(object sender, EventArgs e)
            MailMessage msg = new MailMessage();
            msg.BodyFormat = MailFormat.Html;

            string strBody;
            msg.To = "info@xxxxx.com";
            msg.From = email.Text;
            strBody = "Name:" + fname.Text + " " + Lname.Text + "&lbrBR&gbr" + "Email:" + email.Text + "&lbrBR&gbr"

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