[Sieve] Understand Sieve processing

Hi,

I have the following configuration:

cat > /etc/dovecot/conf.d/99-local-sieve.conf << EOF; plugin { sieve_before = /etc/dovecot/sieve-spam.sieve sieve_before2 = /mail/sieve/global_before sieve_after = /mail/sieve/global_after sieve = /mail/sieve/%d/%n.sieve sieve_dir = /mail/sieve/%d/%n } EOF

cat /etc/dovecot/sieve-spam.sieve require ["regex", "fileinto", "imap4flags"];

if allof (header :regex "X-Spam-Status" "^Yes") { fileinto "Spam"; }

(I removed the keyword "stop;" to proceed rule processing, which does not work)

Now as a user (/mail/sieve/%d/%n.sieve) I want to create my own "Spam" rule:

require ["regex","reject"]; # rule:[SPAM] if allof (header :regex "x-spam-status" "^Yes") { reject text: This E-Mail is SPAM. . ; }

I activate the traces and see the following if the e-mail is SPAM:

 ## Started executing script 'sieve-spam'

3: jump if result is false 3: not jumping 4: fileinto action 4: store message in mailbox `Spam' ## Finished executing script 'sieve-spam'

If the e-mail is not SPAM:

 ## Started executing script 'sieve-spam'

3: jump if result is false 3: jumping to line 4 ## Finished executing script 'sieve-spam'

 ## Started executing script 'roundcube'

3: jump if result is false 3: jumping to line 10 ## Finished executing script 'roundcube'

So my sieve gets only executed if the e-mail is not SPAM. Thats a bit odd.

Could you explain how the sieve processing work and how I can solve this problem?

dovecot --version 2.2.33.2 (d6601f4ec) on Ubuntu 18.04 LTS

Best regards Homy