MailMessage message = new MailMessage(); message.BodyFormat = MailFormat.Html; message.To = "abc@bac.com"; message.Subject = "SMTP Mail Test"; message.BodyEncoding = System.Text.Encoding.UTF8; message.From = abc@bcd.comcd.com; message.Body = "<B>Hello</B>"; message.Fields.Add("http://schemas.microsoft.com/cdo/configuration/smtpauthenticate", "1" ); //Mail account message.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendusername", "" ); //Password message.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendpassword", "" ); SmtpMail.SmtpServer = "MailServer"; SmtpMail.Send(message); 