[imp] Subject encoding issue

[qmail at top-consulting.net]

I have two problems, not sure if they are a bug on my server or maybe  
a bug within IMP.

I am using the latest Horde Webmail distribution:

Horde: 3.3.8
IMP: 4.3.7
c-client library: 2007e
libiconv: 1.13.1
Dovecot IMAP: 1.2.10

Issue #1.

IMP can't display characters from a different charset in the subject  
and instead displays a ? instead of the character. In the body of the  
message the subject displays just fine.

I enabled the rawlog option in Dovecot to see the actual IMAP  
conversation between IMP and IMAP. When it just gets the message  
index, for that particular message I see:

* 4 FETCH (INTERNALDATE "11-May-2010 20:22:31 -0400" RFC822.SIZE 2357  
FLAGS (\Seen) ENVELOPE ("Tue, 11 May 2010 17:53:34 -0600" {86}

IT-F01 Solicitud de acción de Infraestructura Tecnológica. Otro según  
detalle adjunto.

Which is perfectly fine. However, in Webmail I see the subject as being:
IT-F01 Solicitud de acci?n de Infraestructura Tecnol?gica. Otro seg?n  
detalle adjunto.


Issue #2.

IMP shows no subject line at all for messages that contain subjects  
defined encoded in ISO-8859-1. On the server the subject starts like  
this:

=?iso-8859-1?Q?FW:_

What could this be ?

Thank you!