imaplib2 is doing this code for strings:
if isinstance(message, str):
message = bytes(message, 'ASCII')
But our message is already encoded using 'utf-8'.
Then, we can set the message as bytes, encoded using 'utf-8'
in offlineimap and imaplib2 won't change our message.
This patch solves this problem:
WARNING:OfflineImap:
Traceback:
File "/home/kix/src/offlineimap3/offlineimap/folder/Base.py", line 1127, in syncmessagesto
action(dstfolder, statusfolder)
File "/home/kix/src/offlineimap3/offlineimap/folder/Base.py", line 955, in __syncmessagesto_copy
self.copymessageto(uid, dstfolder, statusfolder, register=0)
File "/home/kix/src/offlineimap3/offlineimap/folder/Base.py", line 855, in copymessageto
new_uid = dstfolder.savemessage(uid, message, flags, rtime)
File "/home/kix/src/offlineimap3/offlineimap/folder/IMAP.py", line 668, in savemessage
(typ, dat) = imapobj.append(self.getfullIMAPname(),
File "/usr/lib/python3/dist-packages/imaplib2.py", line 660, in append
message = bytes(message, 'ASCII')
442c88d838