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diff --git a/comm/mailnews/mime/src/mimeunty.h b/comm/mailnews/mime/src/mimeunty.h
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+++ b/comm/mailnews/mime/src/mimeunty.h
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+/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef _MIMEUNTY_H_
+#define _MIMEUNTY_H_
+
+#include "mimecont.h"
+
+/* The MimeUntypedText class is used for untyped message contents, that is,
+   it is the class used for the body of a message/rfc822 object which had
+   *no* Content-Type header, as opposed to an unrecognized content-type.
+   Such a message, technically, does not contain MIME data (it follows only
+   RFC 822, not RFC 1521.)
+
+   This is a container class, and the reason for that is that it loosely
+   parses the body of the message looking for ``sub-parts'' and then
+   creates appropriate containers for them.
+
+   More specifically, it looks for uuencoded data.  It may do more than that
+   some day.
+
+   Basically, the algorithm followed is:
+
+     if line is "begin 644 foo.gif"
+       if there is an open sub-part, close it
+     add a sub-part with type: image/gif; encoding: x-uue
+     hand this line to it
+     and hand subsequent lines to that subpart
+   else if there is an open uuencoded sub-part, and line is "end"
+     hand this line to it
+     close off the uuencoded sub-part
+     else if there is an open sub-part
+     hand this line to it
+     else
+       open a text/plain subpart
+     hand this line to it
+
+   Adding other types than uuencode to this (for example, PGP) would be
+   pretty straightforward.
+ */
+
+typedef struct MimeUntypedTextClass MimeUntypedTextClass;
+typedef struct MimeUntypedText MimeUntypedText;
+
+struct MimeUntypedTextClass {
+  MimeContainerClass container;
+};
+
+extern MimeUntypedTextClass mimeUntypedTextClass;
+
+typedef enum {
+  MimeUntypedTextSubpartTypeText,  /* text/plain */
+  MimeUntypedTextSubpartTypeUUE,   /* uuencoded data */
+  MimeUntypedTextSubpartTypeYEnc,  /* yencoded data */
+  MimeUntypedTextSubpartTypeBinhex /* Mac BinHex data */
+} MimeUntypedTextSubpartType;
+
+struct MimeUntypedText {
+  MimeContainer container;         /* superclass variables */
+  MimeObject* open_subpart;        /* The part still-being-parsed */
+  MimeUntypedTextSubpartType type; /* What kind of type it is */
+  MimeHeaders* open_hdrs;          /* The faked-up headers describing it */
+};
+
+#define MimeUntypedTextClassInitializer(ITYPE, CSUPER) \
+  { MimeContainerClassInitializer(ITYPE, CSUPER) }
+
+#endif /* _MIMEUNTY_H_ */