r/mailmeteor

Hello hello, I have a google sheet that has some empty spaces where new emails are pushed in every now and then, once we have added around 30 ish of new emails, we want to use mail meteor again, but the mail ids are added inbetween newer and older IDs that have already been mailed, then If I launch a new campagin, will it automatically know which IDs have already been mailed to and which ones need to be mailed now? or do I have to make a new sheet and add the newer entries / old entries that haven't been mailed yet so that the same ID doesnt' get mailed twice or more ?