Auto-complete in Enterprise Mail
Because most users send email to the same recipients, Enterprise Mail automatically pulls email addresses from your Sent Items folder, your contacts, and the Global Address Directory (GAL) and saves them separately from emails in your contacts list. These auto-saved email addresses are then used to auto-complete the To and Cc fields when applicable.
To view the list of email addresses used for the auto-complete feature, click the settings icon. Then expand the My Settings and Advanced Settings folders and click Auto-complete in the navigation pane. A list of email addresses will load in the content pane.
Addresses that were pulled from your Sent Items folder can be deleted from the auto-complete list by selecting the addresses and clicking Delete in the content pane toolbar.
Note: Addresses pulled from the GAL or your contacts list cannot be deleted from the auto-complete list.