Problems with emacs + vm

[Jouni Högander]

emacs version is 21.3 and vm is 7.18.

.emacs :
(setq send-mail-function 'smtpmail-send-it)
(setq smtpmail-smtp-server "smtp.kolumbus.fi")

(autoload 'vm "vm" "Start VM on your primary inbox." t)
(autoload 'vm-other-frame "vm" "Like `vm' but starts in another frame." t)
(autoload 'vm-visit-imap-folder "vm" "Start VM on an arbitrary folder." t)
(autoload 'vm-visit-virtual-folder "vm" "Visit a VM virtual folder." t)
(autoload 'vm-mode "vm" "Run VM major mode on a buffer" t)
(autoload 'vm-mail "vm" "Send a mail message using VM." t)

.vm :
(setq vm-toolbar-pixmap-directory "/usr/share/emacs/21.3/pixmaps")
(setq vm-image-directory "/usr/share/emacs/21.3/pixmaps")
(setq vm-imap-server-list
      '(
         "imap-ssl:mail.kolumbus.fi:993:inbox:login:x:x"
       )
)
(setq vm-send-using-mime t)
(setq vm-mime-8bit-text-transfer-encoding '8bit)
(setq vm-mime-8bit-composition-charset 'iso-8859-15)
(setq vm-preview-read-messages t)
(setq vm-auto-decode-mime-messages t)
(setq vm-mime-decode-for-preview t)

The problem is that the subject of the message is not encoded correctly.  If 
I'll put e.g. öäå the recipient of the mail gets ŽöŽäŽåŽÖŽÄŽÅ.  Also my name 
(which also contains scandinavian characters) is encoded incorrectly.  Text 
in the message itself is ok.  The problem exists if I use vm-mail to start 
writing mail.  If I use mail the message is encoded correctly.  Any idea what 
is wrong?

Thanks,

   Jouni