Setting the priority on the new policy
Now that the new policy is created we need to adjust its
priority so it is the last one that applies to the sales users. If this is the
only policy you have in place it should get a priority of 1, which makes it the
highest priority recipient policy. The Default Policy is always the lowest.
1. Under
Recipient Policies, right click on the new Sales policy and choose All Tasks\Move
up

2. Repeat
until it is higher than any other policy that would apply to the users who
match the filter.

-
In my environment, my "Main" policy includes the main domain
names and various string replacement e-mail address templates. The other
polices above Sales are filtered by other attributes. If a user matches sales
and any of the lower priority policies, the lower priority ones will be
ignored. If they match sales and a higher priority policy, the sales policy
will be ignored.
Forcing a recipient policy update
Now that the new policy has been
created and the priorities are setup correctly, you can force Exchange to stamp
the new policy on the matching objects.
1. In
ESM, goto <Org>\Recipients\Recipient Update Service
2. Right
click "Recipient Update Services (<domain name>)" and choose Update
Now

3. Open
up one of the users who met the filter criteria and view their e-mail addresses,
their e-mail addresses should look similar to those below
Conclusion
Using the steps above you can configure Exchange to accept
mail for a new SMTP domain. In addition, you should now be able to setup new
policies to control the e-mail addresses of objects.
Note:
If you change the e-mail address generation rules on an existing recipient
policy or delete a recipient policy, Exchange does not remove the old\previous
addresses set by those policies. This is to prevent the removal of addresses
that users might have used in the past that mail is still being sent to. To
remove old\invalid address, use VBScript or other means.