commands/thread use a BytesIO instead of StringIO object

because the data is in bytes not strings.

1 files changed, 2 insertions, 2 deletions

diff --git a/alot/commands/thread.py b/alot/commands/thread.py
index ad854a5a..354ddd3d 100644
--- a/alot/commands/thread.py
+++ b/alot/commands/thread.py
@@ -15,7 +15,7 @@ from email.message import Message
 
 from twisted.internet.defer import inlineCallbacks
 import urwid
-from io import StringIO
+from io import BytesIO
 
 from . import Command, registerCommand
 from .globals import ExternalCommand
@@ -1000,7 +1000,7 @@ class OpenAttachmentCommand(Command):
                 def afterwards():
                     os.unlink(tempfile_name)
             else:
-                handler_stdin = StringIO()
+                handler_stdin = BytesIO()
                 self.attachment.write(handler_stdin)
 
             # create handler command list