The drugs were sent from South Africa and Nigeria
Cannabis with a street value of €360,000 has been seized at Portlaoise Mail Centre in Co Laois.
18 kilos of the drug were discovered in three parcels sent from South Africa and Nigeria to addresses in Dublin city. One of revenue's detector dogs helped locate the drugs.
Investigations are ongoing.
In a statement Revenue asked anyone who knows someone who is involved in smuggling to contact Revenue’s confidential freephone number on 1890 295 295.