[Dovecot] Sieve notify messages

[Andreas Muehlemann]

Hi All

I'm using dovecot 2.0.16 with the pigeonhole plugin 0.25.
I'm trying to use the notifiy mechanism from sieve to send notifications 
when a mail arrives in the mailbox. The message is checked to be a 8bit 
message, otherwise it is replaced by the default message "Notification 
of new message." How can I create a 8bit message body within the sieve 
script that is accepted by the notification process?

e.g.
notify
    :message "Subject: ${subject}"
    "mailto:em...@domain.com";;

Do I have to put the message body into the :message string? Or how can I 
define a custom message body that is accepted by notify?

Best regards
Andreas