Hi everyone, I am beginning an Exchange migration and I am looking over design options. I would like to establish some kind of proxy server in the DMZ to handle the submission of email over TCP:587 by Exchange users. I've looked over IIS ARR and WAP a bit, but these seem focused on HTTP based services like EWS, OWA, OAB, ActiveSync, etc..
It appears that the non-domain joined Edge Transport server may be an option for this, but it appears to handle all mail flow and offer anti-SPAM features. We use a Barracuda appliance for this and I am not looking to replace that. Can the Edge Transport server only proxy inbound TCP:587 SMTP submission from authenticated Exchange users?