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How does Exchange 2010 deliver internal emails?
Posted on 2012-12-20
I know the answer to this is probably somewhere on this forum but my situation may be unique so I will ask. I know SMTP is only used for Internet bound emails. I know Outlook cache uses X500 addresses. Does Exchange 2010 use X500 exclusively for internal email? Reason I ask is not everyone has an X500 address. In fact, when I create a new mailbox from scratch using the Console, it does not create an X500 address, only an X400 address. I know everyone has a LegacyExchangeDN value regardless so my question I guess is does Exchange use X500 when its available and resort to LegacyExchangeDN (which is the same value) if the X500 address is not there?
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The X500 is used by migrated accounts so that mailflow does not break. If the account is new to exchange, it gets a LegacyExchangeDN. If it is migrated, it gets a new LegacyExchangeDN and an X500 is created to store the old LegacyExchangeDN.
OK, that explains why some users have multiple X500 addresses. Some as many as 5-6 all with different Administrative Group names. So, if a user is not migrated, there is really no need for them to have an X500 address, correct? Exchange will use the LegacyExchangeDN to deliver email.
Yes exchange still uses LegacyExchangeDN/X500 for internal mail delivery.
If you create the mailbox directly on 2010 you don't need an explicit x500 address.
If you create the mailbox directly on 2010 you don't need an explicit x500 address.
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