A routing group is a logical collection of servers used to 
control mail flow and public folder referrals. In a routing 
group, all servers communicate and transfer messages 
directly to one another.

In a routing group, all servers communicate and transfer 
messages directly to one another, as follows: 
 
1.	A user in your Exchange organization uses a mail 
client to send mail to another user.

2.	Using SMTP, the sender's client submits this mail 
to the SMTP virtual server on the Exchange server on which 
the client's mailbox resides.

3.	The Exchange server looks up the recipient of the 
mail message to determine which server the recipient's 
mailbox resides on.

4.	One of two things occurs: 
•	If the recipient's mailbox is on the same Exchange 
server, Exchange delivers the message to the recipient's 
mailbox.

•	If the recipient's mailbox is on another Exchange 
server, the first Exchange server sends the message to the 
recipient's home mailbox server, and it is the recipient's 
home mailbox server that delivers the message to the 
recipient's mailbox.

To accommodate varying network connectivity across servers. 

To restrict the usage of a connector to users in a 
particular area.

USES OF THIS GROUP:

Allows scheduling and control of mail flow. You can 
restrict connector use to a particular routing group or 
schedule the use of a connector.

Allows you to control usage based on message size or 
content by using connector restrictions.