[Pkg-exim4-users] spam filter irritated by duplicate headers

[Thomas Koch]

I just encountered an error(?) with debian's default spam acl:

   warn
     spam = Debian-exim:true
     message = X-Spam_score: $spam_score\n\
               X-Spam_score_int: $spam_score_int\n\
               X-Spam_bar: $spam_bar\n\
               X-Spam_report: $spam_report

This acl seems to check also my outgoing mail. So this message, which I'm 
sending now to the mailing list will be scanned on sending and once again on 
receiving back from the list.

This means, that there will be two sets of X-Spam_... headers which leads to 
the following error:

The userforwardspam router encountered the following error(s):

  malformed numerical string "1
2"

No valid addresses were generated.

The filter is
if "${if def:header_X-Spam_score_int:{true}}" is true then
    if $header_X-Spam_score_int is above 70 then
        pipe "/usr/lib/dovecot/deliver -m spam"
    endif
endif

The mail contains 
X-Spam_score_int: 1
X-Spam_score_int: 2
both added by my server.

Should I rather check for $spam_score_int instead of $header_X-Spam_score_int 
in my my userfilter?

There's already an exim bug asking for the ability to remove headers at acl 
time:
http://bugs.exim.org/show_bug.cgi?id=501

Cheers,

Thomas Koch