On Fri, Nov 13, 2009 at 02:10:11PM -0500, Lou Duchez wrote:

> smtp      inet  n       -       n       -       -       smtpd
>  -o content_filter=mycustomfilter

This service fills the Postfix queue with new mail, content filtering
is done on input, so this setting makes sense.

> local     unix  -       n       n       -       -       smtpd
>  -o content_filter=mycustomfilter

This service, is a delivery agent, it drains mail from the Postfix
queue, content filtering is NOT done on output, so this setting does
not make sense.

    http://www.postfix.org/OVERVIEW.html#receiving
    http://www.postfix.org/FILTER_README.html#advanced_filter

-- 
        Viktor.

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