Can this be done?
 

I'm using a form and a PHP script outside my forum to make bookings for motorcycle trackdays. We book about 80 trackdays per month.

The script I'm using works quite well* only problem I have is that once the form is filled out I need to manually PM the members some info.

Is there any possible way I can trigger a standard PM once the form is filled out? It is a mandatory field in the form for a username to be included in the form.

Big ask but worth a try.