We are having tremendous difficulty adding new e-mail addresses in our administrative accounts as well as updating routing of old e-mail addresses, however my question is as follows:

When the administrator updates an e-mail address that is currently in the main contact list, does it update the contact lists for everyone in our group automatically?  It doesn't appear to do that, so I am going into my personal contact list under my Zoho account and deleting certain old e-mail addresses but they keep popping up every time I type in a name.  How can I stop it from doing that?