Similar to the UK academic network JANET's problems with computer science department emails in the late eighties/early nineties. JANET used X.25 before transiti

Similar to the UK academic network JANET's problems with computer science department emails in the late eighties/early nineties. JANET used X.25 before transitioning to TCP/IP, with its own idiosyncratic email addressing that reversed the order of the domain name segments (relative to DNS order) in an email address. So, a University of Edinburgh CS department members with an address like 'grkvlt@cs.ed.ac.uk' was translated into user 'grkvlt' and host 'uk.ac.ed.cs' then promptly sent off to Czechoslovakia by overly-keen international mail gateways. This led to many CS mail server sub-domains gaining an initial departmental 'd', thus 'dcs', giving 'dcs.ed.ac.uk', 'dcs.gla.ac.uk' and so on...