Domain sieve scripts are not used anymore for mailshare since this commit, it’s still used for user mailboxes.
This feature has been removed because it doesn’t work if domain filter contains a reference to a folder that doesn’t exist for mailshare (Trash or Spam for exemple and it would block sieve script execution.
The only workaround is to create a filter for each mailshare.
What we are willing to do is to activate global sieve scripts for mailboxes without needing to manually configure it for each mailbox, how is that possible ?