Don’t remember exactly who’s in a mailing list or need to knock a few people out of the list for a single missive? When composing a message, type in the mailing list alias normally in the To field. Once it has been checked and matched to an existing list, a plus sign (+) will appear to the left of it. Click the sign and the mailing list will expand into a list of the members, from which you can pick and choose. Note that you can’t collapse the list without deleting the expanded list and retyping the mailing list alias. (Also: Changes you make in the To field are not permanent to the address book.)