postmap header_checks error


postmap header_checks error
\ mess-mate (24 Jan 2008)
. \ Ralf Hildebrandt (24 Jan 2008)

10 msg	mailbox_command (dovecot lda) stopped working, ...
5 msg	mynetworks via LDAP lookup
7 msg	Local recipient table in LDAP problem
2 msg	proxy_read_maps
1 msg	smtpd_restriction_class and it's lookup
8 msg	Message Rejected
12 msg	Customize to filter attachment ?
2 msg	Relay question
14 msg	unnecessary routing?
4 msg	do not use 'reject_maps_rbl'?
9 msg	Fwd: Postfix in OpenVZ.
2 msg	bypass body_checks for local mail?
4 msg	catchall with relay_recipient_maps
4 msg	'Name server failure' is output
3 msg	smtp_sasl_password_maps lookups
16 msg	Postfix Queues on a Ram Disk
15 msg	sendmail compared to smtp sending
3 msg	Postfix does not recognize remote emails
2 msg	How to disable SSLv2 on smtpd opportunistic TLS?

Subject:	postmap header_checks error
Group:	Postfix-users
From:	mess-mate
Date:	24 Jan 2008

hi,
after a postmap header_checks, i've this error:
postfix/postmap[7100]: warning: header_checks, line 398: record is in
"key: value" format; is this an a
lias file?

and this is my header_checks:
/^Message-Id: <(.*)m-m>$/ REPLACE Message-Id:
<$1>

what's wrong with it ?

thanks in advanc