Re: [Evolution] Send mail and “read” indication to Thunderbird

[Ralf Mardorf <silver bullet zoho com>]

On Sat, 23 Jul 2016 10:12:35 +0100, Patrick O'Callaghan wrote:
> On Fri, 2016-07-22 at 21:41 -0700, grooster wrote:
> > I understand your point, but sometimes transferring mail between
> > clients involves export and import.  I thought maybe the "export"
> > from Evolution was the point where the "read" indicator data was
> > dropped.  
>
> There is no "export" (unless you count "save as mbox").

Perhaps the OP misunderstands exactly this.

An email has got headers, that belong to the email itself.

A mailer could add data to the headers, that quasi does not belong to
the email itself, data that belongs only to the used mailer, let alone
that a mailer even could store this kind of data, to another location
instead of adding it to the headers.

The OP might think that read/unred, colour labels, in how many days a
mail should be deleted from the server ... is information that is
available by the mail's headers, if saved as mbox.

The problem with such data is, that even if X-Mymailerfoobar headers
would provide all available data, how should this be transformed to
another mailers data? How e.g. should Evolution account foo be
transformed to Thunderbird account bar?

In short, "There is no "export"" means that Claws does not provide an
option to export data to Thunderbird format and an "export" to mbox,
does not provide all information used by Evolution, that is related to
the email and related to features provided by Evolution.

Some mailers provide equal features, but not all features are part of a
"regular" email.

To transform data from one to another mailers format, by keeping as
much features provided by one mailer, to another mailer requires
software that even would care about releases of different mailers and
to export the mails, but also other data files, IOW even configurations
of other mailers.

Regards,
Ralf