policy banks question
quanah at zimbra.com
Fri Apr 15 02:01:57 CEST 2011
--On Friday, April 15, 2011 1:45 AM +0200 Mark Martinec
<Mark.Martinec+amavis at ijs.si> wrote:
> The magic is not in a regex (which matches everything which
> reaches it), but in the order of rules in smtpd_sender_restrictions.
> Remember that a FILTER in a matching access map just makes its
> argument overlay the content_filter setting. The last FILTER
> triggering has the final say (i.e. wins).
> So the tag_as_originating.re places amavisfeed:[127.0.0.1]:10026
> into a content_filter for everybody first.
> Then smtpd_sender_restrictions proceeds to permit_mynetworks,
> permit_sasl_authenticated and permit_tls_clientcerts. If any
> of these three rules match, the search stops here and the
> amavisfeed:[127.0.0.1]:10026 remains in content_filter.
> If, however, none of the tree rules identifying local nets
> or autheticated roaming users match, then the search reaches
> the 'check_sender_access regexp:/etc/postfix/tag_as_foreign.re',
> which overlays its cargo into a content_filter, which ends up
> being amavisfeed:[127.0.0.1]:10024. This happens for any
> inbound or nonauthenticated client - which is exactly what we
> need (assuming amavisd has a policy bank with originating=>1
> hanging on a TCP port 10026.
Thanks, that is a great explanation. :)
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