On 26/01/17 22:22, Chris Siebenmann wrote:
>       system_filter = ${if ={10025}{$interface_port} 
> {/etc/exim4/exim-system-filter}}
> 
> This worked when I sent a message over the special port. But when I sent
> it over the regular port, Exim immediately complained:
> 
>       Error in system filter: "" is not an absolute path


Use a forced-fail in the ${if } -

system_filter = ${if ={10025}{$interface_port}
{/etc/exim4/exim-system-filter} fail}

-- 
Cheers,
  Jeremy

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