It may not be sufficient in some countries to give only a PO box (when available) as the address and you should therefore include the street name and number with a postcode.
I dtíortha áirithe, is féidir nach leor bosca poist a thabhairt mar sheoladh (i gcás ina bhfuil sé ar fáil) agus ba cheart duit, dá bhrí sin, ainm na sráide, uimhir an fhoirgnimh agus an postchód a thabhairt.