I assume you mean the 'Nickname List' feature that automatically shows email addresses you have used in the past?
All I can suggest is how to delete specific entries from the list, although this won't stop them from being added again in the future:
1. In a new email begin typing the address so that it appears in the drop down list
2. Use the up/down arrow keys on the keyboard to highlight the address to be deleted
3. Click the Delete key on the keyboard
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