Exchange 2010 Accepted Domain

In Exchange 2010 Accepted domain wizard, I see 3 options:
Authoritative Domain
Internal Relay Domain
External Relay Domain.

the way it is explained, I understand that if I select Internal Relay Domain, it will also cover the function of Authoritative Domain, because it says "Email is delivered to Recipient in this Exchange Organiztaion" the same sentence exists for the Authoritative Domain.

External Relay domain explanation says "Emailed is relayed to an email server outside this Exchange Organization" the  same sentence exists for the Internal Relay domain.

it sounds like if I select Internal domain it will also cover the function of Authoritative Domain
if I select External Relay Domain it will also cover the function of Internal Relay Domain.

Any clearer explanation than Microsoft ?

Thank you
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Nick RhodeIT DirectorCommented:
Authoritative Domain and Internal Relay is sound similar. The different that i can come up is say that incoming mail from external being handle by server at site A. You are autoritative for and however for domain the mail will be handle by server at Site B meaning, any incoming mail from it will handle by Exchange Hub at site A, since you set this domain at internal relay, Exchange Hub at Site will pass the email to Exchange Hub at Site B to route the email to mailbox server at Site B

jskfanAuthor Commented:
If I understand:

Authoritative= means the incoming email comes from Edge to Hub to Mailbox
Internal Relay=means the incoming email comes from Edge to Hub to another Hub within the organization then to the mailbox within the organization

External Relay= From Edge to hub to another Edge and/or hub outside the Exchange organization
Nick RhodeIT DirectorCommented:

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