Markus Benning:
> Hello,
>
> i'm using a before queue content filter setup with smtpd_proxy_filter and
> smtp_send_xforward_command=yes. So far no problem.
> But now i want to implement a whitelisting for some checks based on
> the client IP address in the content filter.
> The content filter supports both XFORWARD and XCLIENT.
> Like postfix the content filter uses XFORWARD only for logging.
> If i send the client information within a XCLIENT command
> i'm able to defined restrictions/whitelistings based on the
> (virtual) client address in the content filter.
> But postfix is only able to send XFORWARD.
>
> Is there a reason why theres no option like smtp_send_xclient_command yet?
Yes. The reason is that all client/helo/sender/recipient access
decisions must be made BEFORE the filter, not after. Among other
things, that would break the speed adjust feature which can provide
a significant performance improvement.
Wietse
