I am very new with exchange server.
I have one linux based smtp mail server and one exchange server 2013 installed on windows server 2012.
I am trying to implement a mail flow architecture as:
Both servers will have same domain for example acmecorp.com with same users.
Some user's mail box will be on Exchange server and some user's mail box will be on my linux based mail server.
My problem is, if user having mail box on exchange server sends a mail to user having mail box on my linux based mail server then it should get forwarded to my linux based mail server from exchange server.
I tryied some google search I aget that it is possible using one child domain and send connector, but I do not have any idea of exchange server. Can any one explne me this step by step.