Using Exchange for external email only

Can exchange 2007 be set up so that only external email will work. We would like to have it so employees can not send email internally to each other. How would you configure this to work? Change the mail policy so that they have no local email addresses and the policy reflects just an external address??
holcomb_frankAsked:
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Hypercat (Deb)Connect With a Mentor Commented:
@Rancy - yes, it's definitely not the best choice if there are a large number of users.  

Rancy's suggestion about a Transport Rule is a good one. I checked it out and you can set up a transport rule to check incoming mail to "people" (here you would highlight and select all of the internal users) and then select the action to "silently drop the message."  That would definitely be much easier than having to set each mailbox as I suggested first. You'd have to test it in your environment to make sure it works, as I've never used it.
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Hypercat (Deb)Commented:
If you did that they wouldn't be able to receive any external email either.  The only way I can think of offhand would be to set up all the mailboxes using the Message Delivery Restrictions to reject messages from internal senders. So, you couldn't actually prevent them from sending internal mail, but it would be rejected and not delivered to the mailbox.
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Manpreet SIngh KhatraConnect With a Mentor Solutions Architect, Project LeadCommented:
This is very difficult you can try some Transport rule ... but not sure

Hypercat to your view not sure if this is easy enough with high users in an environment ... :)

- Rancy
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