Background The Exchange Store Driver is a core transport component which lives both on the Mailbox server role (as the mail submission service) and the Hub server role. It is responsible for: ...
Updated Jul 01, 2019
Version 2.0
Blog Post
@Mikhail: The Mail Submission service notifies Hub Transport servers in the same Active Directory site. The Store driver on the Hub Transport server retrieves the message from the Mailbox server and places it in the Submission queue.
More details in http://technet.microsoft.com/en-us/library/aa998825.aspx
Understanding Message Routing > http://technet.microsoft.com/en-us/library/aa998825.aspx#MessageRouting
Receiving Messages for Routing > Retrieving Messages from a Mailbox Server
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