How do I remove a wrong address from the type-ahead list?
When you address an email, if an incorrect address appears in the type-ahead list, you can hide it. In the type-ahead list or the Recent Contacts view, right-click the address and then select Hide in Recent Contacts.
What to do next
To avoid seeing wrong addresses in the type-ahead list in the future, you can change who is added to the type-ahead list. See How do I change who is added to the type-ahead list?.