[Dovecot] Too stupid for sieve (former maildrop user)

[Dieter Knopf]

2010/9/17 Patrick Westenberg <pw at wk-serv.de>:
> User specific sieve files are placed in the home directories while
> mails are stored in the given mail_location (can be a subdirectory
> of the home directory)

Thanks. I tested something and set a sieve-config outside my maildirs:
# dovecot -n |grep sieve
sieve: /home/vmail-sieve/%u/main.filter
sieve_dir: /home/vmail-sieve/%u/
sieve_global_dir: /home/vmail-sieve/global/

Works fine, except i can't include files from sieve_global:
I have a file in /home/vmail-sieve/main at domain.tld/main.filter with:
require ["fileinto", "include"];
include :global "spam.filter";

/home/vmail-sieve/global/spam.filter exists

Errors:
Error: sieve: failed to open script
/home/vmail-sieve/name at domain.tld/main.filter (view logfile
/home/vmail-sieve/name at domain.tld/main.filter.log for more
information)
Log:
main_script: line 2: error: included global script 'spam.filter' does not exist.
main_script: error: validation failed.

I though :global searches inside the sieve_global_dir? Or is there a
way to debug errors like this better?

Thanks