[exim] Strange messages after filter

Hi!

I have strange messages into panic.log after filter:


2006-03-09 04:42:35 1FGVpc-00085j-Qm Error in system filter: malformed
address " Undisclosed-recipients:;\n" in filter file: missing or mal
formed local part (expected word or "<")
2006-03-09 04:42:35 1FGXMJ-0002CS-Pq Error in system filter: malformed
address "" in filter file: empty address


My filter file:
# Exim filter

if $header_X-Bogosity: contains "Spam,"
then
save /var/spool/bogofilter/mailboxes/spam
endif

if $header_X-Bogosity: contains "Ham,"
then
deliver $rh_to
save /var/spool/bogofilter/mailboxes/ham
endif

if $header_X-Bogosity: contains "Unsure,"
then
deliver $rh_to
save /var/spool/bogofilter/mailboxes/unsure
endif


What is problem?

--
With best wishes
Victor Vislobokov