Hi We new install exchange 2003 server in the member server in the child domain. Why email address is not with child domain address and with root domain address? Could do a change it with child domain address? For example, root domain is ms.company.com, child domain is mssanjose.ms.company.com member server is joining with mssanjose.ms.company.com receive and send email address is username@xxxxxxxxxxxxxx now. How to change email address to username@xxxxxxxxxxxxxxxxxxxxxxxx? Thanks ben