check the 'automatically update email addresses based on recipient policy' tick box on multiple users

We have around 2500 users and have so far been controlling the recipient update through the 'automatically update email addresses based on recipient policy' tick box. Some user's don't have external email access so we don't assosiate a external email address with there accounts by unticking the the check box. We now need to update all internal and external address with a new domain name. All users who have external access are in a external email group.

What's the best way to do this? I was thinking of creating filters in the recipient update policy to apply the external domain names the external group and another one with the internal address to everybody after the external policies.

For this to work though i would have to search through and tick about 1000 user 'automatically update email addresses based on recipient policy' check box. Is there a way to automatically do this? I have looked at ldifde but couldn't figure out how to do it. Is there another tool, preferably GUI to do this?
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ajbrowneConnect With a Mentor Author Commented:
Found a little tool called ADModify which seems to work in testing. Program changes all active directory settings on multiple users at once. Great program!
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