transport failed error

Question

CDO.Message message = new CDO.Message();

CDO.IConfiguration configuration = message.Configuration;

ADODB.Fields fields = configuration.Fields;

ADODB.Field field = fields["http://schemas.microsoft.com/cdo/configuration/smtpserver"];

field.Value = "smtp.zoho.com";

field = fields["http://schemas.microsoft.com/cdo/configuration/smtpserverport"];

field.Value = 465;

field = fields["http://schemas.microsoft.com/cdo/configuration/sendusing"];

field.Value = CDO.CdoSendUsing.cdoSendUsingPort;

field = fields["http://schemas.microsoft.com/cdo/configuration/smtpauthenticate"];

field.Value = CDO.CdoProtocolsAuthentication.cdoBasic;

field = fields["http://schemas.microsoft.com/cdo/configuration/sendusername"];

field.Value = "";

field = fields["http://schemas.microsoft.com/cdo/configuration/sendpassword"];

field.Value = "";

field = fields["http://schemas.microsoft.com/cdo/configuration/smtpusessl"];

field.Value = 1;

fields.Update();

message.From = "";

message.To = "";

message.Subject = subject;

message.HTMLBody = txtMessage.Text;

// Send message.

message.Send();