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Transport service
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Mailbox transport
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Back end transport service
-
Front end transport service
EXPLANATION
The Microsoft Exchange Transport Pipeline uses the following services:
- Front
end transport service, which does basic message filtering based on
domains, connectors, senders and recipients. It only connects with the
transport service on a mailbox server and does not backlog any messages
locally
- Transport service, which runs on all mailbox
servers, and handles SMTP mail flow. It helps in message categorization
and content inspection. The transport services routes messages between
the Mailbox Transport service, the Transport Service and Front End
Transport service. This service does not queue messages locally
- Mailbox
Transport, which handles receiving and sending SMTP to the transport
service from the mailbox using remote procedures calls (RPCs).
SOURCE
https://technet.microsoft.com/en-us/library/aa996349(v=exchg.160).aspx
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