The guys are correct - easiest way to do this would be to use the ODBC driver, however, you must run the correct SQL query and ensure you join the Purchase Order table to the Order item table using the correct fields or it will not return the right data.
One issue you will have is that you only want to pull through the most recent transactions so use a query like this to do that your query would look something like this:-
SELECT *, PURCHASE_LEDGER.ACCOUNT_REF, PURCHASE_LEDGER.E_MAIL FROM PURCHASE_ORDER, PURCHASE_LEDGER INNER JOIN POP_ITEM ON PURCHASE_ORDER.ORDER_NUMBER = POP_ITEM.ORDER_NUMBER WHERE PURCHASE_LEDGER.ACCOUNT_REF = PURCHASE_ORDER.ACCOUNT_REF AND RECORD_MODIFY_DATE >= '2013-04-03 00:00:00'
Alternatively there are many one-click commercial solutions to this problem - do a search on Google for "Sage Integration" and you'll find various suppliers who produce products that will do this for you