Michael Tokarev:
> Just discovered a flaw in FILTER_README:
>
> ---
> ...
> 3 - Define a content filtering entry in the Postfix master file:
>
> /etc/postfix/master.cf:
> filter unix - n n - - pipe
> flags=Rq user=filter argv=/somewhere/filter -f ${sender} -- ${recipient}
>
> The /some/where/filter program can be a simple shell script like this:
>
> ...
> SENDMAIL=/usr/sbin/sendmail
> ...
> $SENDMAIL "$" <in.$$
>
> First, this variant will screw mails that contains lines with only
> one dot (sendmail will stop eating input on first such a line).
> At least one flags for sendmail is needed, `-i'.

Aha, this is a case of bit rot. The '.' support in the sendmail
command was added *after* FILTER_README was written.

> Second, why "flags=R" of pipe(8) daemon? Why add Return-Path here?

Does it hurt?

> + flags=q user=filter argv=/somewhere/filter ${sender} ${recipient}
...
> + SENDER="$1"
> + shift
> +
> - $SENDMAIL "$" <in.$$
....
> + $SENDMAIL -i -f "$SENDER" -- "$" <in.$$

There is no need to change the argument vector, and therefore it
MUST NOT be changed.

        Wietse
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