550 5.1.1 unknown or illegal alias

C

Carl

I have a user trying to send to another user on the same network
through Outlook 2003.
When she sends email to the other user, the following error message is
returned-

The following recipient(s) could not be reached:


Zaira Lara on 4/12/2006 2:11 PM


550 5.1.1 unknown or illegal alias: (e-mail address removed)


Zaira Lara on 4/12/2006 2:11 PM


550 5.1.1 unknown or illegal alias: (e-mail address removed)


I've seen this error message posted elsewhere, but the posts were for
people receiving this message from an external source for mail they did

not send.


Anybody have any ideas?
 

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