How much you have to specify of a users address depends on how much the BBS already knows about the user. In which case you will have to supply the full address so the BBS will know how to route the message. This level of addressing is hardly ever needed and normally means that the home BBS is in error. Bulletins can be sent in a similar fashion. The address is made up of a keyword, which can be any six character word and a distribution.
Distributions are local to an area.
Testing Hi everyone, This is Joe Ham testing. 73, WA1XXX . Be descriptive, brief, and always include your full return address in the message. Also please try to limit your distributions to small regions. The BBS originally came into being as the N0ARY BBS in July of 1990 and as of Aug of 1994 had over 1200 active users.