[Exim] Re: Conditional drive me nuts!

| Well, that works for me.  The spamcheck transport looks like this for me:
| spamcheck:
|     driver = pipe
|     command = "/usr/local/bin/spamc -f | /usr/local/sbin/exim -oMr \
|               spam-scanned -i -f \"${if eq {${sender_address}}{}  \
|               {mailer-daemon}{${sender_address}}}\" -- \"\\$LOCAL_PART\""
|     use_shell = true

Oh, this is an old setup.  It is subject to (potential) exploits by
some various exploits due to
    1)  shell metacharacters in addresses
    2)  an address such as "foo@??? being relayed

You should upgrade to the better transport config Nigel devised, as
shown in
    http://dman.ddts.net/~dman/config_docs/

Be sure of this:  The wicked will not go unpunished,
but those who are righteous will go free.
        Proverbs 11:21