I know An Post (Irish national postal agency) has banned all liquids from being posted internationally through their system not alone alcohol which was always in force but we used to be able to get around it
. However They have really got strict in the last few months. I reckon Ally has an arrangement with his courier. The likes of DHL, UPS and FedEx have their own cargo planes so may be able to get around commercial restrictions that others can't. Just hazarding a guess though. Makes life very awkward though and it will cut down on a lot of private transactions unfortunately.