just use SE16 or SE16N to look at tablename USER_ADDR. If you're certain that the names that you have match the names in the SAP accounts, you can use the various fields to filter the data using the MORE and IMPORT FROM TEXT FILE features.
Or you can just use SE16 or SE16N to dump the entire contents of USER_ADDR to a spreadsheet, eliminate the columns you don't want, and have a master directory in spreadsheet form. If your userbase is fairly static, your data will stay "good" for awhile.
Rgds:
Gurpej Singh VIrk