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Re: Odd character, was Re: buster, ekiga.

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On Tue 23 Jul 2019 at 15:31:12 (-0400), Michael Stone wrote:
> On Tue, Jul 23, 2019 at 02:19:27PM -0500, David Wright wrote:
> > I don't see any NUL characters, but x80 as shown below. I'm reading
> > the cached message that mutt downloaded from an IMAP server. Is that
> > different from you?
> 
> I see it as x80 in mutt and x00 in the raw file on the imap server. I
> assume mutt is trying to defang the nul, similar to java's conversion
> to 0xc0 0x80, but I haven't actually looked through the code to
> confirm.

I don't think mutt is doing that. I downloaded a message directly from
my hosting service's IMAP server¹ and that shows <80>, not <00>,
just as mutt does. My experience with mutt is that if a NUL is sent in
a "legitimate"² manner within an email, it causes truncation. I don't
know whether mutt does it or the pager, but as I said elsewhere
it doesn't make me happy.

I'm not sure whether I can get any "closer" to my IMAP server than
that, in order to find whether there's a NUL there; perhaps by
logging in using my credentials? That would require some research
as I don't normally access the service in that way.

One thing we don't know is whether the routes being used by the MTAs
to communicate with each other are 8-bit transparent or not. As
pointed out by tomás, <80> and <00> only differ in the top bit.

> > So it would appear the OP has pasted the Unicode "RIGHT-POINTING
> > MAGNIFYING GLASS" character into their postings, which seems somewhat
> > reasonable as it's used on the Debian web pages to mark all the
> > Message-IDs and references thereto.
> > 
> > Where that gets mangled along the way, I can't guess. but it would see
> > that 0x80 is a reasonable choice as that's a Latin-1 Control Character
> > with the meaning PAD.
> > https://en.wikipedia.org/wiki/Latin-1_Supplement_(Unicode_block)
> 
> I'm not entirely surprised that an MUA that is unaware of the changes
> to internet mail that have happened since the early 80s (codified back
> in 2001) is also unaware of unicode.

My last paragraph wasn't necessarily limited to the behaviour of the
OP's MUA. It's likely the MTAs are more up-to-date that what is
alleged to be a very old MUA.

¹$ curl --url 'imaps://my-hosting-service:993/INBOX;UID=1234' --user 'my-username:my-password' -o Documents/raw-message

²eg as =00 in a quoted-printable encoded message.

Cheers,
David.

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Re: buster, ekiga. peter@easthope.ca - 2019-07-23 17:00 +0200
  Re: buster, ekiga. Greg Wooledge <wooledg@eeg.ccf.org> - 2019-07-23 17:10 +0200
    Re: buster, ekiga. <tomas@tuxteam.de> - 2019-07-23 18:40 +0200
    Odd character, was Re: buster, ekiga. David Wright <deblis@lionunicorn.co.uk> - 2019-07-23 21:20 +0200
      Re: Odd character, was Re: buster, ekiga. <tomas@tuxteam.de> - 2019-07-23 21:30 +0200
      Re: Odd character, was Re: buster, ekiga. <tomas@tuxteam.de> - 2019-07-23 21:40 +0200
        Re: Odd character, was Re: buster, ekiga. Michael Stone <mstone@debian.org> - 2019-07-23 23:00 +0200
      Re: Odd character, was Re: buster, ekiga. Greg Wooledge <wooledg@eeg.ccf.org> - 2019-07-23 21:40 +0200
        Re: Odd character, was Re: buster, ekiga. <tomas@tuxteam.de> - 2019-07-23 22:10 +0200
      Re: Odd character, was Re: buster, ekiga. Michael Stone <mstone@debian.org> - 2019-07-23 21:40 +0200
        Re: Odd character, was Re: buster, ekiga. David Wright <deblis@lionunicorn.co.uk> - 2019-07-25 18:40 +0200
    Re: buster, ekiga. rhkramer@gmail.com - 2019-07-24 13:20 +0200
      Re: buster, ekiga. David Wright <deblis@lionunicorn.co.uk> - 2019-07-24 16:40 +0200
        Re: buster, ekiga. Michael Stone <mstone@debian.org> - 2019-07-24 19:20 +0200
          Re: buster, ekiga. <tomas@tuxteam.de> - 2019-07-24 19:30 +0200
            Re: buster, ekiga. Michael Stone <mstone@debian.org> - 2019-07-24 20:00 +0200
              Re: buster, ekiga. Greg Wooledge <wooledg@eeg.ccf.org> - 2019-07-24 23:00 +0200
              Re: buster, ekiga. Sven Joachim <svenjoac@gmx.de> - 2019-07-24 23:00 +0200
                Re: buster, ekiga. <tomas@tuxteam.de> - 2019-07-24 23:10 +0200
              Re: buster, ekiga. David Wright <deblis@lionunicorn.co.uk> - 2019-07-24 23:00 +0200
                Re: buster, ekiga. <tomas@tuxteam.de> - 2019-07-24 23:10 +0200
                Re: buster, ekiga. Greg Wooledge <wooledg@eeg.ccf.org> - 2019-07-24 23:20 +0200
                Re: buster, ekiga. <tomas@tuxteam.de> - 2019-07-24 23:30 +0200
                Re: buster, ekiga. David Wright <deblis@lionunicorn.co.uk> - 2019-07-25 18:40 +0200
                Re: buster, ekiga. Michael Stone <mstone@debian.org> - 2019-07-25 13:40 +0200
  Re: buster, ekiga. Brad Rogers <brad@fineby.me.uk> - 2019-07-23 17:30 +0200

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