I always forget that my online experience predates the internet: I occasionally will stumble across old articles or postings where my email address is given in

I always forget that my online experience predates the internet: I occasionally will stumble across old articles or postings where my email address is given in three or four formats because it would be addressed differently depending on whether someone was send me email from BITNET, ARPANET or UUCP. The transition to modern standardized hostname hierarchies and DNS happened in the late 80s which removed some of that awkwardness at least. I had a number of correspondents in Australia back then when their email addresses all ended with .oz (IIRC this remained a TLD in the early internet days before ultimately being superseded by .edu.au). The intrinsic quirkiness of using .oz as their TLD was in itself an indication that Australian internet users were very much in a class of their own.