Exchange 2010 and external email

When sending email from outside using Yahoo or Hotmail email account.
what is the route it takes to get to exchange 2010 mailbox.
Assuming exchange 2010 has Mailbox/Hub/CAS and Edge transport in the DMZ.

I want to know if it really goes through CAS or straight to the mailbox,because in some blogs they say public emails go through CAS some say they don't.
If I can get a link to a exchange 2010 book that goes in depth about exchange , that would be fine too.
 

jskfanAsked:
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Suliman Abu KharroubIT Consultant Commented:
CAS is only serve clients, so will not deals with inbound emails.

HUB/edge transport is responsible for routing emails and deliver them to mailbox. event for emails send internally it will be Handled by hub transport role to apply hub transport rules.

http://technet.microsoft.com/en-us/library/bb123494.aspx
Suliman Abu KharroubIT Consultant Commented:
sorry for for spilling mistakes:
 
CAS is only serve clients, so will not deal with inbound emails.

HUB/edge transport is responsible for routing emails and deliver them to mailbox. even for emails sent internally, it will be Handled by hub transport role to apply hub transport rules.

http://technet.microsoft.com/en-us/library/bb123494.aspx
jskfanAuthor Commented:
what about OWA, outlook anywhere, don't they go through CAS?
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Suliman Abu KharroubIT Consultant Commented:
yes, outlook anywhere, owa and oma as well are types of email client access.

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jskfanAuthor Commented:
let me make sure I understand what you are saying,correct me where I am wrong:


1- when inside the LAN : outlook users connect to mailbox through CAS, when they send or receive messages those messages go/come through Hub  to CAS to Outlook. Correct?

2-when outside on the internet, if users use OWA , Outlook anywhere, they connect through CAS to the mailbox, when they send or receive messages those messages go/come through Hub--(edge server if there is one) to CAS to Outllok. Correct?

3-Yahoo user emails sent message to exchange mailbox, they go only through Hub or Edge-Hub to mailbox, they don't go through CAS. Correct?

4-Yahoo users when they receive messages, the messages come from mailbox/CAS to Hub to Edge if there is one then to Yahoo.Correct?

thanks

Suliman Abu KharroubIT Consultant Commented:
1 correct.

2. yes correct, and when they receive emails, they pass throw hub/edge rule ( to apply transport rules ).

3.correct.

4.correct. passing all smtp servers on the internet to rach yahoo smtp server.

a very useful article will clarify everything about smtp:
http://www.experts-exchange.com/Networking/Protocols/Application_Protocols/Email/SMTP/A_1807-A-Crash-Course-in-Email-SMTP.html 
jskfanAuthor Commented:
thanks
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