So I have a very interesting scenario....We plan to move to MS Exchange 2013 from a open source email called Firstclass.....we have one domain (we'll call it contoso.com for this example), we had a previous domain setup of contoso-school.org as well......our current email system and acceptable addresses are both of those domain addresses....they are local DNS domains to us.....so for our Exchange we want these addresses to be acceptable in Exchange as well....but we also are going to add a new domain name to Exchange which would be main email address....which would be contososchool.com....however the domain is owned by 3rd party that runs our website with domain name....so was not going to add to our DNS.
I have exchange setup and working as far as being able to send receive external emails and also have our current Firstclass email system able to send email to exchange users....but I cannot get exchange to email the firstclass account....anytime I try, it just immediately shows up under my exchange account (there servers are all apart of the contoso.com domain).....I tried without having the other domain names added in as Acceptable domains but it still does the same thing....I think because the Exchange server is part of the same domain as other email system its causing this...
Has anyone dealt with this type of situation...I hope I explained it ok
Thanks