Updating a User Account's Email Address
When the email address associated with an account has changed, you can update it on the account's General tab. (The Email box in the User Account Details dialog box is read-only.)
To update the e-mail address associated with an account
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On the Server tab, click the user account.
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In the right pane, click the General tab.
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In the Email box, provide the new address. You can specify multiple email addresses, separated by semicolons. The Email address box cannot contain more than 255 characters.
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Click Apply to save the changes.