Exim filter are run after the message has already been received (eg, the
SMTP connection has already been completed). There is currently no way
to do what you want.
On Fri, 1 Jun 2001, Klaus Arnhold wrote:
> Hi,
>
> can anybody please explain to me how to
> install a filter (.forward) that sends
> back an SMTP-Error 550 'user unknown'
> to a sender if certain conditions apply.
>
> This is probably the easiest to get off
> an unwanted list.
>
> Something like that:
>
> # Exim filter
> if $reply_address contains "@spam.site" and
> $reply_address does not contain "postmaster@"
> then
> mail "Error 550"
> seen finish
> endif
>
> Best regards
>
> Klaus
>
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