sieve rule for "header don't exist"

[Christian Kivalo]

On 2015-03-30 11:25, Reindl Harald wrote:
> is there a way to expresse when the header "X-Spam-Status" *do not*
> exist move the message to a different folder?
> 
> :contains, :matches and :is are not helpful here
> 

Have you tried using the "exist" test from the sieve rfc

5.5. Test exists


    Usage:   exists <header-names: string-list>

    The "exists" test is true if the headers listed in the header-names
    argument exist within the message.  All of the headers must exist or
    the test is false.

    The following example throws out mail that doesn't have a From header
    and a Date header.

    Example:  if not exists ["From","Date"] {
                 discard;
              }

https://tools.ietf.org/html/rfc5228#page-28

i have not tried it myself but the core of rfc 5228 is reported to be 
fully support by pigeonhole

regards
- christian