New GW8 system on oes2sp2 srvr. Preparing to start GWIA and instructions say to stop other Sendmail, Postfix, or other SMTP daemon on srvr. I am assuming that if mail is sent via Postfix now, once I stop the server any system resource that is generating email communiatios will stop working. Is that true?

If that is true, then do I have to create GW account(s) for one or more system users or will GW take over all email functions?