C: A003 APPEND saved-messages (\Seen) {326}
   S: + Ready for literal data
   C: Date: Mon, 7 Feb 1994 21:52:25 -0800 (PST)
   C: From: Fred Foobar <foobar@Blurdybloop.example>
   C: Subject: afternoon meeting
   C: To: mooch@owatagu.siam.edu.example
   C: Message-Id: <B27397-0100000@Blurdybloop.example>
   C: MIME-Version: 1.0
   C: Content-Type: TEXT/PLAIN; CHARSET=US-ASCII
   C:
   C: Hello Joe, do you think we can meet at 3:30 tomorrow?
   C:
   S: A003 NO [OVERQUOTA] APPEND Failed