class client :Netchannels.in_obj_channel -> Netchannels.out_obj_channel ->object..end
method helo : ?host:string -> unit -> string list?host
 defaults to the default hostname of the machine.  This function returns
 the ESMTP lines returned by the server.method mail : string -> unitstring argument is the mail address
 (without < >) that sends the mail.method rcpt : string -> unitstring argument is one of the mail
 address the mail has to be sent to.  You have to use that function for
 each recipient of the mail.
 If the server returns a 551 error (user relocated, see RFC 2821, section
 3.4), the relocated adress is silently used, and the error is not raised
method data : Netchannels.in_obj_channel -> unitmail once, and at least
 rcpt once toomethod rset : unit -> unitmethod expn : string -> string list optionexpn list will try to expand the Mailing list
 list.  If the list cannot be Expanded (reply 252) then None is
 returned.method help : unit -> string listmethod noop : unit -> unitmethod quit : unit -> unit