Roland sir,
i tested your send email code (pbnismtp.pbl file) and it works perfectly. i want to send bulk emails with attachments. So in bulk email tab window(u_tabpg_bulk) i add a listbox and add and delete button to add files to the attachment .
as per the u_tabpg_smtp code  i add following code to send email button of u_tabpg_bulk
// build attachment list
li_max = lb_attachments.TotalItems()
For li_idx = 1 To li_max
ln_smtp.AddToString(ls_attach, lb_attachments.Text(li_idx))
Next
and also add the below code to the send the email section below

// send the emails
For li_idx = 1 To li_max
 try
  // set message properties
  ln_smtp.SetSenderEmail(ls_sender)
  ln_smtp.SetRecipientEmail(ls_recipients[li_idx])
  ln_smtp.SetSubject(ls_subject)
  ln_smtp.SetMessage(ls_body, lb_html)
  If ls_attach <> "" Then
      ln_smtp.SetAttachment(ls_attach)
  End If
   
  // send the email
  li_rc = ln_smtp.SmtpSend()
  catch ( NullObjectError noe2 )
  MessageBox("SmtpSend: Null Object Exception", &
      noe2.getMessage(), StopSign!)
 catch ( PBXRuntimeError pbxre2 )
  MessageBox("SmtpSend: PBX Exception", &
      pbxre2.getMessage(), StopSign!)
 catch ( Throwable oe2 )
  MessageBox("SmtpSend: Other Exception", &
      oe2.getMessage(), StopSign!)
 finally
  If li_rc = 1 Then
   // Success
                  Else
   ls_errmsg = ln_smtp.GetLastErrorMessage()
   MessageBox("SmtpConnect Error: " + String(li_rc), &
       ls_errmsg, StopSign!)
   Exit // Break out of loop
  End If
 end try
 Next
it compile succesfully but when i run and attach a file and click send Email button
i got a error messge box of  smtpconnect.pbx exception
error calling method of a pbni object

when ic lick ok button then i get
powerbuilder application execution error(R0000)
error: error calling method of a pbni object
i tried  li_rc = ln_smtp.Send() instead of li_rc = ln_smtp.SmtpSend()
but still error occurs, if i send without attachments it send successfully
sir, can you explain where i am wrong and how to send attachments in bulk email program?

i am using pb 12.5 classic and 32 bit applications
regards
kumar