Subject that ends with UTF-8, 85 or A0 e.g.:

[Kenichi Asai]

> Darn, that was my best guess.  After I sent the email, I even found some old
> bug reports that 0xa0 was considered "space" on MacOS (e.g.
> https://bugs.python.org/issue7072)
> 
> Still, perhaps there is something different about the way Mutt was built
> versus the quick compile.
> 
> Have you ever built Mutt yourself?  Would you be able to try, and try
> applying the attached patch to a recent release tarball?

Yes, and it solved the problem!!!  Thank you very much!

I haven't compiled mutt by myself for long, so I rewrote the homebrew
formula to use the patch and let homebrew recompile (mutt 2.2.3).

It's really great that I don't have to check Subject every time any
more to see if the last character is truncated.  Thank you Kevin and
all the others for considering and solving this problem.

Sincerely,

-- 
Kenichi Asai