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Exchange Internal-Relay domains and GAL

I have been reading about Exchange Internal-Relay domains and have a quick question. Lets say i have an Internal-Relay domain. There are email addresses that exist in the GAL but their mailboxes are on a different Exchange server.
- If the servers receives a message for an address that exists in the GAL and has a local mbox, it delivers it locally
- if it receives a message for an address that exists in the GAL but doesn't have a local mbox, it relays (send connector) to another server.
- If it receives a message for an unknown address (not in GAL)... what happens? Does it bounce it (NDR) or does it relay it to the Send Connector?
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criskrit
Asked:
criskrit
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1 Solution
 
thomasdavisCommented:
When a message is sent to account@localdomain.com

When a message is sent to the SMTP it searches for the account within the GAL then once located the message is received to the account if the account doesn't exist in GAL it is seen as an invalid account and a bounce back is sent to the sender.
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criskritAuthor Commented:
the message is sent to account@internalrelaydomain.com, it is an internal-relay domain, some mboxes exist on that server, some another Exchange box...
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thomasdavisCommented:
If the account exists in exchange whether it is on one server or configured in a accepted domain then relayed or pointing to anther exchange server in the edge transport it will be received as long as the account exists somewhere within exchange network
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criskritAuthor Commented:
maybe I am not explaining the question very well. Let's say I have mydomain.com and two Exchange internal-relay servers Server1 and Server2. user1@mydomain.com has a mailbox on Server2 and the email address is NOT in the GAL of Server1. If Server1 receives a message for user1 and given that the user is not in the server GAL, will the message bounce, or will it follow the Send Comnector to Server2?
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Jamie McKillopCommented:
Hello,

If the object doesn't exist in the GAL, it will be forwarded to the server on the send connector for the internal relay domain, EXCEPT if you are using some type of recipient verification. This can be on a third-party email firewall or if you are using hub transport servers, it will be turned on by default - http://technet.microsoft.com/en-us/library/bb125187.aspx

If you are using recipient verification, and NDR would be generated in your case.

JJ
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Jamie McKillopCommented:
Just to clarify my previous post, I meant to type edge transport servers, not hub transport servers.

JJ
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