Hi all,
I have run into some difficulties involving headers_add/headers_remove and
don't know how to continue.
All these problems result from my attempts to combine the spam-detection
of exiscan with user configurations.
1) In a bouncing router, can I remove a header added in the DATA ACL? I am
using this router (slighty reduced to increase readability) to bounce
messages with a spam score (obtained by exiscan-acl)
spam_bounce:
driver = redirect
address_data = ${lookup mysql{MYSQL_CHECKDATA}{$value}fail}
data = ${if <condition to match on spam score>
{:fail: This message was classified as spam} \
{:unknown:}}
headers_remove = X-Spam-Report
allow_fail
no_verify
But in the bounce message, the X-Spam-Report header is still there.
2) For a lower spam score, I want to modify the subject and add a header.
I cannot use a system filter, as this does not set $local_part for
messages with multiple recipients. I can neither use a "simulated" system
filter (39.8 in the manual), as the headers_add/remove functions are not
allowed in user filters.
So I have tried to do this using this router (again reduced):
spam_subject:
driver = redirect
address_data = ${lookup mysql{MYSQL_CHECKDATA}{$value}fail}
headers_remove = ${if spamscore > user-defined level
{subject} \
{}}
headers_add = ${if <spamscore > user-defined level>
{X-Spam: Yes\
${if <modify subject>\
{\nSubject: ***SPAM*** $h_subject:}{} } } \
{}}
data = ${quote:$local_part}@$domain
redirect_router = virtual_forward
no_verify
virtual_forward is the next router in my configuration, so I'm
unconditionally "passing on" to the next router.
This works surprisingly well. The only problem is that virtual_forward may
redirect to another local address, again running the spam_subject router
and adding a second set of X-Spam and Subject headers.
I've tried replacing the data line with
data = ${if first_delivery {${quote:$local_part}@$domain}{:unknown:}}
but this skips the router for any further local addresses.
Any ideas how I could solve this?
Jens
