Send mail with a progress bar

hi, I have created a page that sends an email to some recipients via an external SMTP
Sending works correctly!
I would like to put a progress bar that shows the status of the operation.
I have a “inviaemail” Server Connect for send.
I set up a modal with a bar whose progress bar is connected to “sendemail.executing”, but the bar doesn’t move. What I’m doing wrong?