announcement list: how control order that smartlist sends emails?

Hello, Anyone know how to control the order by with Smartlist sends the emails contained within its announcement list? At the moment, my announcement list seems to send alphabetically, by domain. E.g First it sends address@domain.ac then address@domain.co.* etc I would like to personally received mail first and last; thus I'd know when the server began sending mail and when it completed sending to the list. TIA Howard