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diff --git a/comm/mailnews/mime/src/mimesun.h b/comm/mailnews/mime/src/mimesun.h
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+++ b/comm/mailnews/mime/src/mimesun.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 _MIMESUN_H_
+#define _MIMESUN_H_
+
+#include "mimemult.h"
+
+/* MimeSunAttachment is the class for X-Sun-Attachment message contents, which
+   is the Content-Type assigned by that pile of garbage called MailTool.  This
+   is not a MIME type per se, but it's very similar to multipart/mixed, so it's
+   easy to parse.  Lots of people use MailTool, so what the hell.
+
+   The format is this:
+
+    = Content-Type is X-Sun-Attachment
+  = parts are separated by lines of exactly ten dashes
+  = just after the dashes comes a block of headers, including:
+
+      X-Sun-Data-Type: (manditory)
+      Values are Text, Postscript, Scribe, SGML, TeX, Troff, DVI,
+      and Message.
+
+      X-Sun-Encoding-Info: (optional)
+        Ordered, comma-separated values, including Compress and Uuencode.
+
+      X-Sun-Data-Name: (optional)
+        File name, maybe.
+
+      X-Sun-Data-Description: (optional)
+      Longer text.
+
+      X-Sun-Content-Lines: (manditory, unless Length is present)
+      Number of lines in the body, not counting headers and the blank
+      line that follows them.
+
+      X-Sun-Content-Length: (manditory, unless Lines is present)
+        Bytes, presumably using Unix line terminators.
+ */
+
+typedef struct MimeSunAttachmentClass MimeSunAttachmentClass;
+typedef struct MimeSunAttachment MimeSunAttachment;
+
+struct MimeSunAttachmentClass {
+  MimeMultipartClass multipart;
+};
+
+extern MimeSunAttachmentClass mimeSunAttachmentClass;
+
+struct MimeSunAttachment {
+  MimeMultipart multipart;
+};
+
+#define MimeSunAttachmentClassInitializer(ITYPE, CSUPER) \
+  { MimeMultipartClassInitializer(ITYPE, CSUPER) }
+
+#endif /* _MIMESUN_H_ */