kind=defined
names=append
visibility=public

--- append(mailbox, message, flags = nil, date_time = nil)

Sends a APPEND command to append the message to the end of
the mailbox.

ex).

  imap.append("inbox", <<EOF.gsub(/\n/, "\r\n"), [:Seen], Time.now)
  Subject: hello
  From: shugo@ruby-lang.org
  To: shugo@ruby-lang.org
  
  hello world
  EOF

