There is a new function called 'go vcn', which will allow you to temporarily configure your outgoing mail to read @ccn.cs.dal.ca, long enough to unsub from a mailing list you do not wish to receive mail from any longer. It may take several hours for the change to occur so sending an email to yourself until you see the change is the best way to tell. Once you have sent your unsubscribe message to the mailing list in question, wait a day and change it back to 'chebucto.ns.ca' otherwise, if the 'ccn' address stops being supported, those sending email to that address will get their email bounced.