Handling Terminated Employees in Exchange 2007
When an employee leaves our organization, we assign their mailbox so that it can be accessed by another employee to ensure that we don't miss any important e-mail messages. After about 60 days we want to set their mailbox so that internet e-mail will be rejected and the sender will receive a "550 No Such User Here" error, but we don't want to actually delete the mailbox until some future time after we've archived it.
I've found 2 techniques for doing this:
1 - Set a recipient policy to only receive mail from the terminated user's account
2 - Set the SMTP address for the mailbox to something that doesn't actually exist. ie, change firstname.lastname@example.org to email@example.com
I've adopted technique #2 and it works as far as preventing e-mail from being delivered to the mailbox, but in my testing I've yet to see the error come back so that the sender knows they have attempted to mail to a non-existing mailbox. I can't tell if Exchange 2007 isn't issuing the error or if the sending mail systems are just throwing it away. I've tested sending from a Google Apps E-mail account and from an account at my local cable company.
Anyone have any suggestions? I've not been able to come up with anything from numerous internet searches.