From f789ee4a8606ef1c34f2f18389b46c9b54ee04ae Mon Sep 17 00:00:00 2001
From: Guido van Rossum <guido@python.org>
Date: Thu, 20 Mar 1997 14:42:17 +0000
Subject: [PATCH] Avoid crashes with nested multipart/mixed parts.

---
 Lib/mimify.py | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/Lib/mimify.py b/Lib/mimify.py
index ce4c4baebf..15f0981749 100755
--- a/Lib/mimify.py
+++ b/Lib/mimify.py
@@ -367,7 +367,14 @@ def mimify_part(ifile, ofile, is_mime):
 	line = message_end
 	while multipart:
 		if line == multipart + '--\n':
-			return
+			# read bit after the end of the last part
+			while 1:
+				line = ifile.readline()
+				if not line:
+					return
+				if must_quote_body:
+					line = mime_encode(line, 0)
+				ofile.write(line)
 		if line == multipart + '\n':
 			nifile = File(ifile, multipart)
 			mimify_part(nifile, ofile, 1)
-- 
2.50.1