There is a player named Osiris Incarna that awhile ago bought stacks of wood planks from me. Since then he periodically writes to me if I have any wood, I sell it to him and that's it. The conversation is usually cordial, and the usage of "mate" indicates that he is an aussie. Well, maybe. He is also usually online at the similar time zone.
Little pun but unless the guy starts speaking to you in full aussy using slangs or tells you he has a pet magpie that chases him around trying to blind him, I would not assume someone using "mate" is australian
