Problem was a complicated smarthost specification which exim4 is happy
to honor bug exim-config postinst could not grok.
error was:

+ RET=20 Unsupported command "${if" (full line was "${if
received from confmodule.

Issue may be use of continuation but I'm not sure about that.

Marc Auslander <> writes:

>after the recent security update to exim4 im seeing:
>dpkg: error processing package exim4-config (--configure):
> subprocess installed post-installation script returned error exit status 20
>what now?

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