[exim] RFC

Dear list,

This is probably a FAQ, but one i couldn't find and answer for...

Is there a way to limit rfc 1413 callouts to non-authenticated connections?

This way, MUA's won't be bothered with a timeout when the callout is stuck
in someones firewall.

I'm looking for something along this line:
rfc1413_hosts = ${if eq{$authenticated}{}{*}{}}

But i can't find any variable like $authenticated.

Thanks a lot,
--
- Pieter