[exim] address rewritting when "yielded unparseable address:…

Scenario:

^test@$primary_hostname   "$h_from:"        Ffs
^test@$primary_hostname   "<zupa@???>"   Ffs

First rule in some cases will return "yielded unparseable address:
empty address in address" which is fine and expected.

But exim will stop rewritting in such case. It won't go to next rule (which
I wanted to be a fallback rule). And that's unexpected.

Docs ( http://www.exim.org/exim-html-current/doc/html/spec_html/ch-address_rewriting.html )
don't seem to mention anything about such case, so I assumed next rewrite rule to be applied.

For now I have a workaround for such problem:
^test@$primary_hostname   "${if !eq {${address:$h_from:}}{} {${address:$h_from:}}fail }"        Ffs
^test@$primary_hostname   "<zupa@???>"   Ffs
When "fail" is returned then exim uses next rule.

I wonder if that's (stopping when unparseable address occurs) a bug (and exim
should try next rule) or a feature (if feature then would be nice to see it documented) ?

jgh_ on #exim suggests that this is a feature.

--
Arkadiusz Miśkiewicz, arekm / ( maven.pl | pld-linux.org )