Server roles allow an administrator to split the functions of
an Exchange server and place each role, or a combination of roles, on different
servers in the organization. This can be done for performance reasons,
management reasons, or any other reason deemed necessary by the organization's
policies.
Exchange 2007 introduces five roles
·
Edge Transport
·
Hub Transport
·
Client Access
·
Mailbox
·
Unified Messaging
·
Edge Transport
The
Edge Transport role is installed on the edge of the network and therefore is
installed on a standalone server that is not a member of the Active Directory
domain. This allows the Edge Transport to perform recipient lookups and
Spam filtering.
Hub Transport
The Hub
Transport role is responsible for all internal mail flow. This role is similar
to the bridgehead server in an Exchange 2000/2003 organization. In fact it originally
was called the Bridgehead Role until it was changed.
Client Access
The
Client Access Role is similar to the role a Front-End server would play in an
Exchange 2000/2003 organization. The Client Access server is the server
that users connect to with their mail client, mobile device, or web browser.
Mailbox
The
simplest of the roles has to be the Mailbox Role. Quite simply the Mailbox role
holds the Exchange databases within which the user mailboxes are contained. It
is also home to the Public Folder databases if you enabled Public Folders.
(They are not enabled by default in Exchange 2007)
Unified Messaging
The Unified Messaging role is responsible for merging your VOIP infrastructure with your Exchange organization.
Port exchange server 2013 mail flow:
Port 25 – It was used for SMTP
Port 587 – It was used for Client Connections (POP\IMAP)
Port 717 – It was used for outbound proxy connections.
Port 465 – It was used to accept proxy connection that was received on port 587
Port 475 – Mailbox Transport Delivery Service listens to this port to send mails to the users.
Port 2525 – It was used when CAS and MBX servers are collocated on the same server.
Port 587 – It was used for Client Connections (POP\IMAP)
Port 717 – It was used for outbound proxy connections.
Port 465 – It was used to accept proxy connection that was received on port 587
Port 475 – Mailbox Transport Delivery Service listens to this port to send mails to the users.
Port 2525 – It was used when CAS and MBX servers are collocated on the same server.
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| Image Source : Microsoft |
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