Ultimately we did end up using the BCC method to get sent emails. Ran into some problems due to what we think is a 2GB size limitation of the daily .grp file.
Also didn't always seem to handle SMTP email with BCC deliveries at the same time as POP3 retrieval. This is for a client that does their alerts daily at one time and uses the POP3 retrieval of the BCC and bounced emails to confirm there was a delivery attempt of the email and its final status.