For messages with multiple mailbox recipients, use the first 20 recipients to select a Mailbox server in the closest delivery group, based on the proximity of the AD site.
For messages with a single mailbox recipient, select a Mailbox server in the target delivery group and give preference to the Mailbox server based on the proximity of the AD site.Then, for each mailbox database, it looks up the delivery group (which can be a Routable DAG, a Mailbox delivery group or an AD site) and the associated routing information.īased on the number and type of recipients, the Front End Transport service performs one of the following actions: The Front End Transport service resolves message recipients to mailbox databases (unless the recipient is a distribution group, for example) by querying AD. Failure to do so results in the e-mail service being perceived as unavailable by the external senders as this service does not queue messages. Specifically, outgoing messages are proxied through the Front End Transport service when the FrontEndProxyEnabled parameter on an applicable Send connector is set to $True in the Exchange Management Shell, or the Proxy through client access server option is selected in the Exchange Administration Center:įigure 3.1: Exchange 2013 Send Connector Proxy Enabledįor incoming messages, the Front End Transport service looks for a single healthy Transport service on a Mailbox server to receive the message.
#Message rerouted and delayed by store driver exchange 2007 series
If you would like to read the other parts in this article series please go to:Īs explained in the previous articles of this series, this service runs on all Client Access servers and acts as a stateless proxy for all inbound and outbound external SMTP traffic.įor outgoing messages, the Transport service on Mailbox servers uses Send connectors to communicate with the Front End Transport service.
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