PT 8.5 SendMCFEMail - Is there any documentation on this?

I am not getting the emails that are being sent using SendMCFEmail(%This) in app pkg PT_MCF_MAIL.MCFOutboundEmail, method Send.   This is being called from PT_WF_NOTIFICATION.Notification, method Send.   Prior to PT 8.50, SendMail was being used.  This code was changed in PT 8.50 and I am not able to get the emails sent, and there is no documentation on how to troubleshoot this.  When I change the code back to using SendMail, the emails are being sent.  I had to also change the separation delimiter back to ; from the comma (,) that is used for SendMCFEmail.   The emails are being initiated