I have a central office site and I would like to know if it is considered acceptable to install Exchange 2010 CAS/Edge-Transport roles on VPS(s) in external datacentre(s) with a VPN back to our HQ where our mailbox and hub servers are.
My main goal is to have mail queued should the main site go down due to a local ISP failure.
Would there be any issues with this design and anything to be aware of?
Answer
There are plenty of SMTP-Backup providers out there. Use one of these if you only want to “queue” mails.
If you want to pursue your idea of an own server/VPS, then just use the EDGE-Transport role on the VPS, and not CAS, as CAS will not work anyway if it has no connection to the Mailbox server.
Attribution
Source : Link , Question Author : morleyc , Answer Author : MichelZ
