Hi,

On Sat, 2017-08-05 at 23:33 +0200, Andre Klapper wrote:
> On Sat, 2017-08-05 at 09:30 +0000, adg adg82439 wrote:
> > So I guess its maybe not Evolution alone, but I do not know what I
> > could configure on my hotmail account or somewhere else.
> 
> Might be a question for a Hotmail forum if it's not an Evolution
> issue?

Right, it is not an Evolution issue. The problem is that Hotmail server
(and basically Microsoft Exchange servers) garble a GPG
signed/encrypted messages when it's a multipart, when it's received
through the transport layer (from the outside, like through SMTP and
the like).

On Fri, 2017-08-04 at 21:34 +0200, Ángel wrote:
> I see you added a workaround for reading such broken messages,
> however I think it'd be more important to avoid sending such bad
> messages [when using evolution-ews].
> I have opened Bug 785840 for this.

I'm not much keen to pre-garble the message in evolution(-ews/-mapi),
that doesn't sound right at all. I know there are tweaks here and there
in the code to support servers with certain issues, but why to add
more? There is no benefit for it. Since the change I made in evolution
is able to decrypt/verify signature even on such messages changed by
the Exchange servers, which it is just supposed to be. The way it is
done also shows that text/plain part in the message preview, currently
an empty line above the actual message body - that's for the case when
there would be something sane written. Your proposal would cause it to
be shown always, which is a no go.

I'm also not wanting to try to catch the right message body structure
for Exchange server version X, and then they'll change it in version Y,
or even in an update of version X, and then the extra code would
misbehave. This is really not the way to go.

I'm pretty satisfied with the current state (after the "workaround" in
evolution code). It's for the latest stable only, of course, but it's
not "my problem", that there are people stuck with ancient versions.
They can always ask maintainers of the distribution to backport the
changes, where some can be easy, some not. The maintainers are also
understaffed, sadly.

On Sat, 2017-08-05 at 09:30 +0000, adg adg82439 wrote:
> I do not know what I could configure on my hotmail account or
> somewhere else.

There is no such server option for regular users, as far as I know. I
doubt there is any for the server admins, but as regular users cannot
change it anyway, then it doesn't matter that much.

There is an option in Evolution, Edit->Preferences->Mail Accounts-><the 
account>->Edit->Security tab->Pretty Good Privacy (OpenPGP) section
->Prefer inline sign/encrypt for plain text messages. That avoids the
multipart thing, thus the server doesn't garble the message structure
(untested, but as it's text/plain from the outside...). The only
disadvantage is that it works for plain text only, not for HTML
messages. Whether it's available also in 3.18.x I do not know, it's a
long time ago.
        Bye,
        Milan
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