Character display problem in mumi and my mail client

[Jack Hill]

Hi Guix,

It appears that mumi (or at least the instance of it running on 
issues.guix.gnu.org) has problems displaying some non-ASCII characters. I 
noticed it with '’'. Compare

https://issues.guix.gnu.org/issue/36207

with

https://debbugs.gnu.org/cgi/bugreport.cgi?bug=36207

In the former, Ludo's name displays as 'Ludo¢' while it the latter, it 
displays correctly as 'Ludo’'.

However, in Ludo's reply the character is displayed correctly.

Does this indicate that my mail client (alpine on Debian Stretch) is doing 
the wrong thing? It seems that mumi could handle this situation better 
since it debbugs appears to handle it correctly.

Looking at the raw mail downloaded from debbugs, I see that I'm sending 
mail as with the following encoding:

```
Content-Type: text/plain; FORMAT=flowed; CHARSET=ISO-8859-7
Content-Transfer-Encoding: 8BIT
```

while Ludo's mail is:

```
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: quoted-printable
```

Interestingly, when I download the mbox file for my mail from debbugs, and 
looking at it Emacs with my en_us.UTF-8 locale, the cents-symbol appears. 
Using iconv to convert the file from ISO-8859-7 to UTF8, causes the 
correct character to display. So what looks to be happening is that mumi 
is interpreting my messages using the wrong encoding.

Thoughts? Is this something we want to fix?

This reminds me of rjbs's talk, "Email Hates the Living". [0]

Best,
Jack

[0] http://yapcasia.org/2011/talk/59

P.S. How are we tracking issues and patches for mumi? bug-guix@ and 
guix-patches?