mconnect opens a connection to the mail server on
a given host, so that it can be tested independently of all
other mail software. If no host is given, the
connection is made to the local host. The server at the
other end of the connection expects any communication over
this connection to conform to the Simple Mail Transfer
Protocol (SMTP). Exit by typing the
quit command. Typing end-of-file will cause an
end of file to be sent to the server. An interrupt closes
the connection immediately and exits.
Raw mode: disable the default line buffering and
input handling. This gives you a similar effect as
telnet to port number 25, not very useful.
Specify the port number instead of the default SMTP
port (number 25) as the next argument.
Specify a destination host instead of the default host (localhost).