To enter in both a physical address and a mailing address (like a PO Box) for a member, you would use the physical address as the main address for the member.  The mailing address would then have to be entered as an alternate address. Enter the current date in the "from" field and all 9s in the "to" field for the date range (meaning permanent retention). Once this is done, the alternate address will be used for any member mailings.