external and internal mail flow

let suppose i am having edge, cas and mailbox 2013 then what is the process of mail flow happens.
ELS ELSAsked:
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Will SzymkowskiSenior Solution ArchitectCommented:
Edge always sits on the perimeter network which will receive all incoming and outgoing external email. Even though the Transport Services reside on the mailbox role in Exchange 2013 external mail does still flow through the CAS server. Below is a great link that illustrates the transport pipeline and how mail flows internally and externally.

https://technet.microsoft.com/en-us/library/aa996349(v=exchg.150).aspx

Will.
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ELS ELSAuthor Commented:
ok grt but if one user is on mailbox 1 and second on mail 2 then how mail flow will work between them?
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Will SzymkowskiSenior Solution ArchitectCommented:
In Exchange 2013 messages internally rout from Mailbox Server to other mailbox servers.

Will.
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ELS ELSAuthor Commented:
so any components like AD site and services etc used in this process.
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Will SzymkowskiSenior Solution ArchitectCommented:
Exchange uses AD Sites and Service to tell Exchange what Site Path to use based on cost. This has nothing to do with the actual routing mechanisum built-in to Exchange, aside from telling Exchange which is the best path based on cost.

Will.
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ELS ELSAuthor Commented:
ok thanks
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Will SzymkowskiSenior Solution ArchitectCommented:
You're Welcome.

Will.
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