use must be done through some external mechanism. Once connected,
the client must identify itself:
- HELO [<username>]
+ HELO <username>
->
HELO <username> <server-addr> <server-port>
- If the client doesn't supply <username>, the server will compute
- one and return it.
-
Possible errors: INVALIDNAME
1.2. Global commands
ERROR INVALIDNAME
- All names must be unique.
+ All names must be of non-zero length and must be unique.
Possibly returned by: HELO