> > First of all, sorry for mailing you privately. This mailing lists
> > doesn't behave like any of the other lists I'm subscribed to, so I
> > often forget to hit ”reply to all”…
>
> On my mailer (claws) I just hit reply and it all works.
I don't use a ”mailer” (whatever that is), I use Gmail's web
interface.
Well, what I am saying then is that it is gmail's interface that is
wrong, not the mailing list. My MUA handles it correctly.
> > I'm not sure why you can't find your (c) entries, I find mine
> > easily on my system, and I know for sure I didn't add them myself
> > (since I have the © character included in my own keyboard layout
> > anyway – Shift+AltGr+c).
>
> FWIW, on my keyboard it is AltGr-Shift-c. Order matters and
> Shift-AltGr-c does not work.
What do you mean ”order matters”? You hit Ctrl and AltGr at the same
time and keep them down while pressing c, don't you?
No I don't because order matters.
I'll it right now:
First pressing Shift, keeping it down, then also pressing AltGr and
keeping both down while pressing c: ©
Nope, no character results.
Now, pressing AltGr, keeping it down, then also pressing Shift and
keeping both down while pressing c: ©
© QED
Doesn't matter on my computer anyway.
Does matter on mine. And on every other computer I remember using.
So I believe it was worth pointing out to the OP in case his system
behaves like mine.
This was tested with my own keyboard layout (Swedish ̣– Johnny
Rosenberg). Now I'll test it with the standard Swedish layout:
Shift Shift+AltGr Shift+AltGr+c: ©
AltGr AltGr+Shift AltGr+Shift+c: ©
Works perfectly (on my computer, operating system=Manjaro Linux,
desktop environment=XFCE).
openSUSE Leap 15.0 with UK keyboard and XFCE.
Kind regards
Equally kind regards 
Dave