Gerald Turner a écrit :
> Hello, I have been using SpamAssassin integrated with Postfix via spampd
> SMTP proxy and I have the following header_checks file:
>
> /^X-Spam-Level: \*{8,}/ DISCARD Spam score 8+
> /^X-Spam-Level: \*{4,}/ REJECT Spam score 4+
>
> There are cases where I'd rather DISCARD the low score mail (>= 4, < 8)
> than REJECT, for instance:
>
> When the mail contains mailing-list headers - some mailing lists
> unsubscribe after too many bounces, particularly Debian with
> open/unmoderated lists.
>
> When the mail was sent to a quasi-spamtrap address - I'm aliased on a
> few hosts with webmas...@example.com type addresses, some of which
> will generate bounce warnings to mailer-daemon who is aliased to
> several people, evil!
>
> Unfortunately Postfix header_checks can only process one header at a
> time, there's no way to compound conditions of multiple headers. I've
> searched and can't seem to come up with any possibility of configuring
> Postfix to conditionally discard rather than bounce. I'm on the verge
> of customizing an example Perl milter to do the job, but it seems like
> something that should be built-in to either Postfix, spampd, or perhaps
> amavisd-new - any suggestions?
>
first, add an SA rule to detect mailing lists. for example
header H_FROM_ML ...
score H_FROM_ML 0.01
(actually, you will need multiple rules, then combine them with a meta).
then your header checks would become
/^X-Spam-Status: Yes, score=([8-9]|\d{2}).*H_FROM_ML/ ....
some notes:
- unless you are calling SA during the smtp transaction, you should not
reject mail (ie after it was queued by postfix)
- discarding mail is risky.
- spammers can forge list headers...
- There are other cases when you don't want to reject (mail to
ab...@example.com, ... etc).
