On 01/31/2013 04:31 PM, Ludwig Hügelschäfer wrote:
> On 31.01.13 22:05, Daniel Kahn Gillmor wrote:

>> If a "prominent MUA" cannot deal with PGP/MIME, please name it 
>> explicitly, so we can pressure its vendor or authors to fix it (or,
>> in the case of free software, so we can fix it ourselves).
> 
> MS Outlook, at least out of the box.

Thanks, that's helpful!  What happens when an MS Outlook user receives a
PGP/MIME-signed message?  What do they see?

Is this true with all versions of MS Outlook?  If not, how prominent are
the affected versions?

> Nice demonstration ;-) You caught me. Wanted to say that Thunderbird
> cannot display inline images from HTML messages when it converts them
> to plaintext for display.

Thanks for clarifying!  You're helping me think through the problem
space here.

But I think that might still not be what's going on here.  I don't think
that thunderbird does any conversion on its own; It's simply choosing
which part of a multipart/alternative message to display.  If the sender
had made the message structure like this, i suspect thunderbird would
have displayed the images:

└┬╴multipart/alternative
 ├┬╴multipart/mixed
 │├─╴text/plain
 │├─╴image/png inline
 │└─╴text/plain
 └─╴text/html

(or maybe it would have reverted to the text/html part anyway, since the
other top-level alternative is now multipart/mixed instead of text/plain)

> I don't find it "bad". It's just "be caucious, you might spoil your
> setup when not used right". Unintended mouseclicks or keystrokes happen.

Yep, i agree with you entirely on this, and i think your warning here
"be cautious; you might break things here" is the right message to give
people.

Regards,

        --dkg

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