Hi Experts,
We are planing to deploy exchange email server (Exchange Server-2013 Multi-Role servers) in our HQ (contoso.com) and 4 Edge Transport in other 4 client development sites(client1.com, clinet2.com, client3.com and Client4.com) so that applications running in HQ can send emails to respective client development sites domain using edge transport. Development sites are using external email address (mail.clinet1.com and so on). There is no requirement of incoming mail on Edge in Client site because they have compete hosted email solution. Just our Edge transport in client will process the mail received from HQ and will forward to Client's External email address.
I would appreciate if you can help me to get answer for these queries.
Do you think this conceptual design is possible? Exchange solution in HQ and Edge transport in Client site and that Edge will forward emails to External Domain using send connector for restive client's domain?
What secure (Only secure) port we need to open on Edge so that It can talk to External Email servers to deliver emails?
If we don't want to expose our Multi-Role exchange severs in HQ to Internet , do you think Exchange server in HQ should be capable for incoming emails using one additional EDGE or still need to expose CAS services in HQ. We need Outlook, OWA and Active Sync as well for HQ (contoso.com).
What secure port we need to open in case of CAS server?