Am Do 25.03.04 um 00:41 CET schrieb Dallman Ross <dman(_at_)nomotek(_dot_)com>:
On Thu, Mar 25, 2004 at 12:24:41AM +0100, Stefan Heinrichsen wrote:
For spamfiltering I set the header "X-To-Whitelist" and
"X-Blacklist". I want a mail to be filterd if: both headers are yes,
none of them or only X-Blacklist.
So it would be like
A | (A & B) | (!A & !B)
= A | (!A & !B)
= A | !B
So I use the rule
* ^X-Blacklist: Yes | !^X-To-Whitelist: Yes
If I now receive a mail containing none of this both headers I get:
No match on "^X-Blacklist: Yes | !^X-To-Whitelist: Yes"
where is the mistake?
Well, it's easier if we use procmail's natural ANDing of conditions.
First of all, if you see X-Blacklist is set you want to filter, right?
:0
* ^X-Blacklist: Yes
do_something
Otherwise, if X-Blacklist is NOT set, then *only if X-Whitelist
is also unset, do something:
:0 E # use the "else" flag if above recipe was nondelivering
* ! ^X-Whitelist: Yes
do_something
Well that would work but the do_something is in my case a block of about
40 lines (some additional spamfilters) which are changed frequently. So
it's not could to have it twice in the procmailrc.
mfg
stefan
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