[Exim] how to save mails from acl_check_content

Hello list,

how can I save identified spam with a treshhold of about score 15
instead of deleting it to a file on my harddisk ?
(format: ${localpart}@${domain}_${datetime})

CURRENT:
  deny  message = This message scored $spam_score points. Congratulations!
        spam = nobody:true
        condition = ${if >{$spam_score_int}{150}{1}{0}}

WANTED: (please show me the correct syntax)
  warn  message = This message scored $spam_score points. Congratulations!
        spam = nobody:true
        condition = ${if >{$spam_score_int}{150}{1}{0}}
        save_to_file /spammails/$localpart@$domain_${timestamp}

How can this be performed ?

Thanks for any help in advance.


- tom

--
Thomas Baumann // tirili+list.exim@???