Outlook 2003 Email Addr Problem

Using Microsoft Office 2003 Outlook a user has an email address that is spelled incorrectly. Like jdoe@thisplace.co He has spelled the .com wrong leaving off the m (it should be .com). The intellisense pops up this wrong address when he starts to enter jdoe@ in address of a New Email. . How could I delete the intellisense address of jdoe@thisplace.co that always appears as you type in the address on a new email ?
…..He has the correct address in contacts but chooses to type it in.

Thanks for any help