Question : after creating a new account in exchange i have this error 550 Unknown User

Hi

what i did ?
i created a new account in 2003 server automatically the mail account is created.
after that i went to my gmail to send a test then i had this error
550 "Unknown User..
how i can fix this please..

and all our accounts works fine only this new one..

Answer : after creating a new account in exchange i have this error 550 Unknown User

Have you tried forcing the Recipient Update service to rebuild it's internal database list of users.  This might encourage the message to go away?  Check the event logs afterwards for any error messages.

Open Exchange System Manager, expand Recipients, Select Recipient Update Service, then right-click on the Recipient Update Service (YOURDOMAIN) in the right-hand pane and choose rebuild and click Yes.

What service pack level is your exchange server?  You may need to update it with SP2
Right click your server and choose properties from within Exchange Server Manager

http://www.microsoft.com/Downloads/details.aspx?familyid=535BEF85-3096-45F8-AA43-60F1F58B3C40&displaylang=en