Use cStringIO.StringIO to fix #1132

This undoes a small subset of the changes from
fa3dd1b04567c4ea03fa658c3838b569531c79f5 and thus fixes #1132.

The io.BytesIO object was not able to handle the unicode header names
that where returned by envelope.construct_mail, which in turn did just
copy them from the envelope header.

1 files changed, 2 insertions, 1 deletions

diff --git a/alot/helper.py b/alot/helper.py
index ce307875..1c569a23 100644
--- a/alot/helper.py
+++ b/alot/helper.py
@@ -10,6 +10,7 @@ from datetime import timedelta
 from datetime import datetime
 from collections import deque
 from io import BytesIO
+from cStringIO import StringIO
 import logging
 import mimetypes
 import os
@@ -606,7 +607,7 @@ def email_as_string(mail):
     :param mail: email to convert to string
     :rtype: str
     """
-    fp = BytesIO()
+    fp = StringIO()
     g = Generator(fp, mangle_from_=False, maxheaderlen=78)
     g.flatten(mail)
     as_string = RFC3156_canonicalize(fp.getvalue())