at System.Net.Mail.MailCommand.CheckResponse(SmtpStatusCode statusCode, String response)
at System.Net.Mail.MailCommand.Send(SmtpConnection conn, Byte[] command, MailAddress from, Boolean allowUnicode)
at System.Net.Mail.SmtpTransport.SendMail(MailAddress sender, MailAddressCollection recipients, String deliveryNotify, Boolean allowUnicode, SmtpFailedRecipientException& exception)
at System.Net.Mail.SmtpClient.Send(MailMessage message)
at bookpratha.error.MailToSendSite(String tomail, String mailsubject, String frommail, String bodymail, String ccmail, String bccmail, String hostname, String musername, String mpass) in D:\Nilesh\Projects\Bookpratha New\LIVE COPY\website\bookpratha\error.aspx.cs:line 89
Mailbox unavailable. The server response was: Invalid domain or domain is disabled.