Need to modify a new cpanel exim mail filter

Hi,
I am modifying a new exim mail filter as per below, all works well but.

1. wondering how to log the output to logfile /var/log/filter.log which has been created with permission 0644?

2. How would I just fail the message and not send a reply back to the spammer?

3. is there a $header_to option to stop mail sent to a specific addresses

Thanks in advance.

/etc/cpanel_exim_system_filter_new


# Filters all incoming an outgoing mail logfile /var/log/filter.log 0644
# reject spam based on email body
# logfile /var/log/filter.log 0644 

if
    $message_body contains "Good Day" or
    $message_body contains "Hello PayPal" or
    $message_body contains "Dear valued PayPal" or
    $message_body contains "forward to your positive reply"
then
    fail text "This message has been rejected because it looks like you are spamming us."
endif

if
    $header_from contains "rezult" or 
    $header_from contains "secret"  
then
    fail text "Your email has been rejected because it looks like you are spamming us."
endif

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