Does anyone have any experience with mailing 8.9x14cm (3 1/2 x 5 1/2") postcards? I've sent them within Australia, but I'm not sure if they'd work going abroad. They're a bit below your standard 10x15/4x6" size...
I've got 100 sheets of it sitting here, but if not I'll go and try to track down a box of Ilford postcard paper.