Hi John,

thanks again for looking into the issue.

> I still need to be able to reproduce this issue.
> Do you have a sample email that exhibits this problem?

I now made some further tests and I confirm that the proposed patch has nothing
to do with the problem.

I am joining several mails to show the results that depend only the different 
setting of leave_body_unchanged.

root@roundup:~# locale
LANG=en_US.UTF-8
LANGUAGE=
LC_CTYPE="en_US.UTF-8"
LC_NUMERIC="en_US.UTF-8"
LC_TIME="en_US.UTF-8"
LC_COLLATE="en_US.UTF-8"
LC_MONETARY="en_US.UTF-8"
LC_MESSAGES="en_US.UTF-8"
LC_PAPER="en_US.UTF-8"
LC_NAME="en_US.UTF-8"
LC_ADDRESS="en_US.UTF-8"
LC_TELEPHONE="en_US.UTF-8"
LC_MEASUREMENT="en_US.UTF-8"
LC_IDENTIFICATION="en_US.UTF-8"
LC_ALL=

My roundup instance
- is almost trunk
- is running in an LXC container
- in a virtualenv
- on Debian buster

(roundup) venv@roundup:~/projects/roundup$ python
Python 3.7.3 (default, Jul 25 2020, 13:03:44) 
[GCC 8.3.0] on linux

-- 

    Mathias Behrle
    MBSolutions
    Gilgenmatten 10 A
    D-79114 Freiburg

    Tel: +49(761)471023
    Fax: +49(761)4770816
    http://www.m9s.biz
    UStIdNr: DE 142009020
    PGP/GnuPG key availabable from any keyserver, ID: 0xD6D09BE48405BBF6
    AC29 7E5C 46B9 D0B6 1C71  7681 D6D0 9BE4 8405 BBF6