dovecot - Apr 2016 - Redirect indicator issue in Maildir flag seems to be an issue [missing?]

Hi,

I've got an issue with the latest Thunderbird, although I'm not sure
this is when the problem started (version 45.0) it has an add-on
"mailredirect (version 0.8.7)".

In the past I've been able to redirect mail (bounce them) and I get a
nice little green arrow like indicator (in TB) to  show that I
redirected the particular email.

Now, that green arrow appears briefly, then it goes away and I can no
longer tell by looking at my email list if the email has, in fact, been
bounced or not.

I suspect it is dovecot on the Debian server:

  dovecot-common                     1:2.1.7-7+deb7u1
  dovecot-core                       1:2.1.7-7+deb7u1
  dovecot-imapd                      1:2.1.7-7+deb7u1
  dovecot-pop3d                      1:2.1.7-7+deb7u1

It isn't just Thunderbird though, as I just tried to redirect using a
Squirrelmail plugin, and it gives me the same problem; so I don't think
it is at the MUA end of the deal.  It /may/ be that TB is setting the
flag and resetting it or dovecot is resetting it....

Any ideas?  Nobody else has seen this yet?

Thanks
AndrewM

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On 23.04.2016 20:27, Andrew McGlashan wrote:
> Hi,
Hi Andrew,
> I've got an issue with the latest Thunderbird, although I'm not
sure
> this is when the problem started (version 45.0) it has an add-on
> "mailredirect (version 0.8.7)".
> 
> In the past I've been able to redirect mail (bounce them) and I get a
> nice little green arrow like indicator (in TB) to  show that I
> redirected the particular email.
I use the redirect mail plugin as well, even though with currently with
Thunderbird 38.6.0 on Linux (Ubuntu) together with Dovecot 2.2.23 and I
don't see this problem.
The only thing that I see is that with Squirrelmail I never get this little
green arrow (or a 'b' at the end of the filename (using maildir)).

So it's either the new Thunderbird, or the old Dovecot...
Isn't much of a help, but a data point at least...

Cheers,
  Juri