On Fri, Mar 21, 2014 at 02:24:49PM +0000, Nick Warr wrote:

> This is the entry in master.cf
> 
> dfilt     unix    -       n       n       -       -       pipe
>     flags=Rq user=filter argv=/etc/postfix/disclaimer -f ${sender} --
> ${recipient}
> 
> Any advice or recommendations?

Edit the filter script, and make sure it invokes the sendmail(1)
command with a "-i" option and (as should be already the case)
without any "-t" option.

        sendmail -i -f "$sender" -- "$@"

if the argument list is simply copied from the arguments to
"disclaimer", add a "-i" before "-f".

-- 
        Viktor.

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